Geophilomorph centipedes and the littoral habitat - Books and ...
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TAR<br />
Terrestrial Arthropod Reviews 4 (2011) 17–39 brill.nl/tar<br />
<strong>Geophilomorph</strong> <strong>centipedes</strong> <strong>and</strong> <strong>the</strong> <strong>littoral</strong> <strong>habitat</strong><br />
Anthony D. Barber<br />
Rathgar, Exeter Road, Ivybridge, Devon, PL21 0BD, Engl<strong>and</strong><br />
e-mail: abarber159@btinternet.com<br />
Received: 1 October 2010; accepted: 27 October 2010<br />
Summary<br />
More than 40 species from at least 20 genera in 6 or more families of <strong>the</strong> <strong>Geophilomorph</strong>a (Chilopoda)<br />
are recorded from marine <strong>littoral</strong> <strong>habitat</strong>s in various parts of <strong>the</strong> world. Although <strong>the</strong>re is little recent work<br />
on <strong>the</strong>ir physiology it seems that <strong>the</strong>y have <strong>the</strong> capacity to tolerate <strong>the</strong> osmotic <strong>and</strong> respiratory regime<br />
that is involved <strong>and</strong> <strong>the</strong>ir anatomical adaptations to a burrowing habit <strong>and</strong>, at least in some cases, <strong>the</strong>ir<br />
behaviour makes <strong>the</strong>m a fairly constant component of sea-shore ecosystems where <strong>the</strong>y sometimes occur<br />
in surprisingly large numbers. It is suggested that <strong>the</strong> richness of <strong>the</strong> food source in <strong>the</strong>se <strong>habitat</strong>s, along<br />
with o<strong>the</strong>r factors such as shelter, microclimate <strong>and</strong> possibly absence of parasites <strong>and</strong>/or predators would<br />
be <strong>the</strong> main reason why <strong>the</strong>se now terrestrial animals have re-invaded <strong>the</strong> seashore so many times since<br />
<strong>the</strong>ir fi rst appearance in <strong>the</strong> Palaeozoic. Th eir tolerance of seawater <strong>and</strong> occurrence on coasts could lead<br />
to passive distribution by rafting <strong>and</strong> <strong>the</strong> occurrence of isolated populations could result in genetic<br />
diff erences.<br />
© Koninklijke Brill NV, Leiden, 2011.<br />
Keywords<br />
<strong>Geophilomorph</strong>a ; Chilopoda ; <strong>littoral</strong> <strong>habitat</strong>s.<br />
Introduction<br />
Arguing from body fl uid data, Little ( 1990 ) considered myriapods <strong>and</strong> insects to be of<br />
marine origin; many legged arthropods would seem to have been some of <strong>the</strong> earliest<br />
l<strong>and</strong> arthropods with, so has been suggested, a previous long aquatic history (Selden<br />
<strong>and</strong> Edwards, 1989 ). Divergence of <strong>centipedes</strong> <strong>and</strong> millipedes has been estimated at<br />
442 ± 50 Ma (Pisani et al, 2004 ). Terrestrial millipede fossils date back to <strong>the</strong> Devonian<br />
(Shear <strong>and</strong> Selden, 2001 ) whilst evidence for tracheal systems in arthropods comes<br />
from <strong>the</strong> Mid Silurian (Wilson <strong>and</strong> Anderson, 2004 ). Th e earliest centipede remains,<br />
leg segments of Scutigeromorpha, date from <strong>the</strong> Upper Silurian (Shear <strong>and</strong> Selden,<br />
2001 ). Th ese long-legged animals would have probably have been surface running<br />
ra<strong>the</strong>r than litter inhabiting. It is not until <strong>the</strong> Late Carboniferous that a possible<br />
© Koninklijke Brill NV, Leiden, 2011 DOI 10.1163/187498311X546986
18 A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39<br />
geophilomorph is recognised in <strong>the</strong> fossil record (Mundel, 1979 ). Th e divergence<br />
of <strong>the</strong> <strong>Geophilomorph</strong>a is minimally dated by a form from <strong>the</strong> Upper Jurassic,<br />
Eogeophilus jurassicus (Shear <strong>and</strong> Edgecombe, 2010 ). Present day geophilomorphs<br />
comprise about 1,300 valid taxa, grouped into 14 families representing approxima -<br />
tely 40% of known centipede species (Rosenberg, 2009 ) <strong>and</strong> are elongate, worm<br />
like animals characterised by homonomous segmentation with 27 -191 leg-bearing<br />
segments.<br />
Th e earliest report of a halophilic centipede is Leach’s description of <strong>the</strong> geophilomorph<br />
now known as Strigamia maritima (Leach, 1817 ). Since its recognition<br />
fur<strong>the</strong>r <strong>littoral</strong> species have been reported; Lewis ( 1981 ) listed 13 <strong>and</strong> we now know<br />
of more than 40 taxa from all continents except Antarctica <strong>and</strong>, of <strong>the</strong>se, all but<br />
two are geophilomorphs (Barber, 2009a ). Corresponding numbers for <strong>the</strong> o<strong>the</strong>r<br />
myriapod groups are signifi cantly smaller with only about four to six defi nitely halophilic<br />
millipedes known (out of a total of about 10,000 species described). O<strong>the</strong>r<br />
terrestrial arthropod groups also have shore dwelling species but (with <strong>the</strong> exception<br />
of Acari) <strong>the</strong>y represent but a small proportion of <strong>the</strong> known types. According to<br />
Cheng ( 1976 ), of <strong>the</strong> species of insects known about 3% are aquatic or have aquatic<br />
larval stages but of <strong>the</strong>se, only a fraction, “perhaps several hundred species” are marine<br />
or intertidal.<br />
At present <strong>the</strong>re are no known species of freshwater <strong>centipedes</strong> although Strigamia<br />
maritima has been found in a more or less completely fresh water site (Armitage,<br />
1982 ); <strong>the</strong>re are two or three millipedes with adaptations for fresh water (Golovatch<br />
<strong>and</strong> Kime, 2009 ). Hence <strong>the</strong> interesting question as to why <strong>the</strong>re are relatively<br />
so many halophilic geophilomorphs (at least 20 genera in six or more diff erent families;<br />
Table 1 )?<br />
Table 1. <strong>Geophilomorph</strong> families <strong>and</strong> genera containing known or possible <strong>littoral</strong> species. (Based on<br />
Barber, 2009a )<br />
Family Genera with <strong>littoral</strong> species Genera with possible <strong>littoral</strong><br />
species<br />
Mecistocephalidae Mecistocephalus<br />
Oryidae Orphnaeus<br />
Himantariidae Gosothrix, Stigmatogaster<br />
Schendylidae Hydroschendyla, Nyctunguis,<br />
Pectiniunguis, Schendyla, Schendylops, Bimindyla, Nesonyx,<br />
Th indyla<br />
Ballophilidae Ballophilus, Caritohallex Ityphilus<br />
Lintotaeniidae Strigamia<br />
Dignathodontidae Henia<br />
Geophilidae Erithophilus, Geophilus, Lionyx,<br />
Maoriella, Mixophilus, Pachymerium,<br />
Polycricus, Tuoba, Tretecthus<br />
Diphonyx<br />
Aphilodontidae Aphilodon
A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39 19<br />
Why do terrestrial animals invade <strong>the</strong> <strong>littoral</strong> <strong>habitat</strong>?<br />
Little ( 1990 ) has a telling diagram (Fig.7.3) of <strong>the</strong> food web of <strong>the</strong> thysanuran Petrobius<br />
brevistylis. Although Petrobius is almost confi ned to <strong>the</strong> maritime zone <strong>and</strong> feeds on<br />
maritime plants its main predators are of terrestrial origin, Lithobius sp. (centipede)<br />
<strong>and</strong> Zygiella sp. (spider).<br />
Here we may have a clue as to why so many diff erent groups of terrestrial animals<br />
might have invaded <strong>the</strong> <strong>littoral</strong> zone. Intertidal areas are often highly productive. Larger<br />
algae <strong>and</strong> microscopic forms colonise many seashores <strong>and</strong> estuarine sites are rich in<br />
nutrients brought down by rivers. Seashores also receive quantities of (mostly) plant<br />
material (algae, seagrass, etc.), often in large amounts, brought in by <strong>the</strong> tides <strong>and</strong> <strong>the</strong>re<br />
may be a signifi cant input of guano from seabirds in some locations. In various stages<br />
of decomposition all this material can provide nutrition for a range of herbivores <strong>and</strong><br />
detritivores which in turn are available to carnivores including <strong>centipedes</strong>. Th ere are<br />
various examples in <strong>the</strong> literature of what appear to be energy fl ow from <strong>littoral</strong> to<br />
terrestrial <strong>habitat</strong>s in this way. For instance, Polis <strong>and</strong> Hurd ( 1995 ) report on extraordinarily<br />
high densities of spiders on small isl<strong>and</strong>s in <strong>the</strong> Gulf of California which<br />
<strong>the</strong>y attribute to a combination of energy fl ow from marine to terrestrial food webs<br />
<strong>and</strong> <strong>the</strong> absence of larger predators. Polis et al ( 2004 ) discussed <strong>the</strong> whole issue of<br />
trans-boundary transfer between <strong>habitat</strong>s, including that of sea to l<strong>and</strong>. In an extreme<br />
case of this, Catenazzi <strong>and</strong> Donnelly ( 2007 ) report on <strong>the</strong> relationship between <strong>the</strong><br />
terrestrial desert <strong>and</strong> <strong>the</strong> highly productive marine environment at Paracas Bay,<br />
Peru. Consumers in this nocturnal intertidal food web included Collembola,<br />
Th ysanura, Diptera, Coleoptera, Talitridae, geophilomorph Chilopoda ( Th indyla <strong>littoral</strong>is<br />
), Solifugi, Araneae, Scorpionidae <strong>and</strong> Reptilia. Th e <strong>centipedes</strong> were recorded at<br />
an average density of 4.26±0.96 m -1 with a maximum of 49 m -1 . Th e extremely high<br />
densities of Strigamia maritima sometimes seen on North European shores are very<br />
striking ( Figure 1 ).<br />
Even if, perhaps, in o<strong>the</strong>r locations, <strong>the</strong>re is actually no net energy transfer between<br />
marine-<strong>littoral</strong> <strong>and</strong> terrestrial food webs at <strong>the</strong> interface, shoreline production <strong>and</strong><br />
washed up material would broaden <strong>the</strong> resource base <strong>and</strong> could entice terrestrial animals<br />
into <strong>the</strong> <strong>littoral</strong> zone.<br />
In addition to food resources, rocky shores provide crevices which provide shelter<br />
<strong>and</strong> could trap air as could burrows in mud <strong>and</strong> s<strong>and</strong>. Shingle provides sheltered interstices<br />
<strong>and</strong> <strong>the</strong> drift line a possible rich, if more temporary, shelter <strong>and</strong> food resource.<br />
Such environments can provide a degree of protection against wea<strong>the</strong>r <strong>and</strong> predators as<br />
well as a relatively humid environment <strong>and</strong> <strong>the</strong> sea itself will provide an ameliorating<br />
eff ect on climate in <strong>the</strong> <strong>littoral</strong> zone. Th e possible absence of parasites due to unfavourable<br />
conditions for <strong>the</strong>ir alternate hosts might also be a factor in favour of entry of<br />
species into this <strong>habitat</strong> (Lewis, 1981 ).<br />
<strong>Geophilomorph</strong>s have been observed to feed on a variety of annelids <strong>and</strong> molluscs<br />
according to Lewis ( 1981 ). He describes recorded food which including leodocid<br />
worms (fed on by Hydroschendyla maritima (Grube, 1872)) <strong>and</strong> unspecifi ed crustaceans.<br />
Barnacles ( Balanus balanoides ), Orchestia gamarella , Sphaeroma sp. top shells <strong>and</strong>
20 A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39<br />
Figure 1. Strigamia maritima (Leach, 1817 ) male in shingle Seil Isl<strong>and</strong>, Scotl<strong>and</strong>.<br />
o<strong>the</strong>r gastropods ( Littorina saxatalis ) <strong>and</strong> lumbricid worms were all observed at various<br />
times to be fed on by Strigamia maritima . Th e same author also described how Strigamia<br />
maritima attacked small Orchestia (or Drosophila if off ered) by tearing <strong>the</strong> prey to<br />
pieces. When attacking larger Orchestia , 1cm or more in length (which it only did if<br />
<strong>the</strong>y were damaged or dying) it made a transverse slit <strong>and</strong> pushed its head <strong>and</strong> anterior<br />
segments inside <strong>and</strong> <strong>the</strong> poison claws were seen to be constantly in motion macerating<br />
tissue whilst <strong>the</strong> centipede was involved in what seemed to be external digestion <strong>and</strong><br />
suctorial feeding. Group feeding, as observed in this species could be advantageous in<br />
dealing with prey that would o<strong>the</strong>rwise be invulnerable to <strong>the</strong>m. Alternatively, small<br />
specimens could enter barnacles o<strong>the</strong>rwise inaccessible to larger animals <strong>and</strong> bring<br />
about <strong>the</strong>ir opening. Lewis suggests that it is possible that pheromones might be<br />
involved in this group behaviour.<br />
Members of o<strong>the</strong>r orders of <strong>centipedes</strong> such as <strong>the</strong> scutigeromorphs <strong>and</strong> lithobiomorphs<br />
with <strong>the</strong>ir relatively long legs <strong>and</strong> rapid movement would be able to move<br />
from <strong>the</strong> supra<strong>littoral</strong> zone into <strong>the</strong> upper intertidal area at low tide <strong>and</strong> back again<br />
before <strong>the</strong> tide came in <strong>and</strong> submerged <strong>the</strong>m or shelter, if necessary, in air fi lled crevices<br />
as <strong>the</strong> scorpion Serradigitus <strong>littoral</strong>is (Williams, 1980) of Baja California is thought to<br />
do (Due <strong>and</strong> Polis, 1985 ). Maybe some could even adopt a lifestyle similar to that<br />
described in <strong>the</strong> wolf spider Pardosa lapidicina Emerson, 1885 which moves back <strong>and</strong><br />
forth with <strong>the</strong> tides (Morse, 1997 ). However, such an option would not be available<br />
to <strong>the</strong> relatively slow moving geophilomorphs which certainly could migrate up
A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39 21<br />
<strong>and</strong> down <strong>the</strong> beach on a seasonal basis as described for Strigamia maritima (Lewis,<br />
1961a) but would not be able to do this twice a day as required by following <strong>the</strong> tidal<br />
cycle; in any case, this would be unlikely to be energy effi cient. If <strong>the</strong>refore, <strong>the</strong>y were<br />
able, because of <strong>the</strong>ir morphology <strong>and</strong> physiology, to take up more or less permanent<br />
residence in areas directly exposed to seawater <strong>the</strong>n this would be advantageous in<br />
exploiting <strong>the</strong> <strong>littoral</strong> resource.<br />
Adaptation of geophilomorphs to <strong>the</strong> <strong>littoral</strong> <strong>habitat</strong><br />
A survey of <strong>the</strong> locations from which seashore geophilomorphs have been recorded<br />
includes rock crevices, shingle, under rocks or stones on shingle, s<strong>and</strong> or mud, under<br />
stones etc. on salt marshes, under seaweed or o<strong>the</strong>r plant material (e.g Posidonia ,<br />
Zostera ) or o<strong>the</strong>r material <strong>and</strong> “str<strong>and</strong> line debris”. Str<strong>and</strong>ed material off ers a ra<strong>the</strong>r<br />
open <strong>habitat</strong> <strong>and</strong> so it is not surprising that it is colonised by a diversity of arthropods<br />
including <strong>centipedes</strong> whilst crevice dwelling off ers great opportunities for <strong>the</strong> more or<br />
less burrowing geophilomorphs with <strong>the</strong>ir worm-like bodies <strong>and</strong> <strong>the</strong>ir modes of<br />
locomotion.<br />
Animals living here need to be able to tolerate (or avoid by migration or survival in<br />
air spaces) <strong>the</strong> eff ect of inundation with its consequential respiratory <strong>and</strong> osmoregulatory<br />
implications. Animals will be immersed in seawater twice daily for a shorter or<br />
longer time depending on <strong>the</strong>ir location on <strong>the</strong> shore although not normally facing<br />
continuous 24 hour immersion. Th ey will also be in contact with saline substrates<br />
(algae, s<strong>and</strong>, stones, etc.) <strong>and</strong> will be taking in salt ions in <strong>the</strong>ir food. In estuarine<br />
conditions <strong>the</strong>re will also be an issue of varying salinity, generally below that of full<br />
sea-water.<br />
Unfortunately most of <strong>the</strong> work on <strong>the</strong> physiology <strong>and</strong> adaptations of <strong>littoral</strong><br />
geophilomorphs is ra<strong>the</strong>r old <strong>and</strong> fur<strong>the</strong>r studies are clearly desirable.<br />
Body design<br />
Manton ( 1965 ) identifi ed a range of features that adapted geophilomorphs to <strong>the</strong>ir<br />
burrowing <strong>and</strong> crevice dwelling life <strong>and</strong>, although she generalised from studies on a<br />
small number of species, her observations do seem to have some relevance. However, it<br />
must be borne in mind that <strong>the</strong>re is considerable variation as between diff erent species,<br />
genera <strong>and</strong> families. For instance, <strong>the</strong> head is more or less oblong ra<strong>the</strong>r than tapered<br />
in some species (e.g. some Geophilu s spp., Pachymerium ferrugineum ) nor do all show a<br />
clear ‘transition’ <strong>and</strong> members of <strong>the</strong> Mecistocephalidae are unlike o<strong>the</strong>r geophilomorphs<br />
in a number of ways.<br />
When walking, geophilomorphs proceed relatively slowly although with little lateral<br />
undulation, feeling <strong>the</strong>ir way forward with <strong>the</strong>ir antennae (all are eyeless) <strong>and</strong> with<br />
<strong>the</strong> capacity for backward movement if required. Th is allows <strong>the</strong>m to explore cre -<br />
vices in search of prey or shelter <strong>and</strong> to retract as necessary <strong>and</strong> when sheltering <strong>the</strong>ir<br />
fl exible multi-segmented bodies allow <strong>the</strong>m to coil up <strong>and</strong> occupy a limited volume<br />
( Figure 2 ).
22 A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39<br />
Figure 2. Hydroschendyla submarina (Grube, 1872) as found coiled up in a rock crevice at Wembury,<br />
Engl<strong>and</strong>.<br />
When burrowing in an earthworm-like manner, <strong>the</strong> large number of short segments<br />
each of which can shorten <strong>and</strong> thicken allows extension <strong>and</strong> contraction of trunk<br />
regions. In addition <strong>the</strong> head is relatively small <strong>and</strong> often tapered with mouthparts<br />
which sweep semi fl uid material from <strong>the</strong>ir partially externally digested prey into<br />
<strong>the</strong> digestive system. Th e anterior third of <strong>the</strong> trunk (in front of <strong>the</strong> so called “transition”,<br />
if present) may be very distinctively tapered <strong>and</strong> with <strong>the</strong> narrow oesophagus,<br />
heart <strong>and</strong> nerve cord having been described as centrally positioned to minimise deformation<br />
by changes in <strong>the</strong> dimensions of <strong>the</strong> segments. Manton describes <strong>the</strong> cuticle<br />
as being thicker in this anterior region <strong>and</strong> forming an armour of sclerites including<br />
intecalary tergites <strong>and</strong> sternites which allow for changes in shape whilst at <strong>the</strong> same<br />
time individual sclerites have fl exibility at <strong>the</strong> margins <strong>and</strong> stiff ness in <strong>the</strong> centre so<br />
that thrusts can be transmitted but <strong>the</strong> armour remains intact <strong>and</strong> <strong>the</strong> plates do not<br />
crack. In addition <strong>the</strong> longitudinal muscles are relatively large. An anterior region of<br />
<strong>the</strong> body of <strong>the</strong> head <strong>and</strong> anterior trunk with relatively stout legs, adapted for strong<br />
slow movements, allows extension <strong>and</strong> contraction of <strong>the</strong> front of <strong>the</strong> body with headon<br />
burrowing to make <strong>the</strong> burrow wide enough for <strong>the</strong> remainder of <strong>the</strong> body to<br />
follow. ( Figure 3 )
Body fl uid regulation<br />
A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39 23<br />
Figure 3. Stigmatogaster subterranea (Shaw, 1789) to show <strong>the</strong> body shape of a geophilomorph with a<br />
distinct transition. Although normally a terrestrial species, this specimen was actually found under a stone<br />
on estuarine mud, River Lynher, Cornwall, Engl<strong>and</strong>.<br />
As a legacy of <strong>the</strong>ir original marine origin myriapods have body fl uid concentrations<br />
comparable to that of crustaceans (Little, 1990 ). For <strong>the</strong> two marine species studied by<br />
Binyon <strong>and</strong> Lewis ( 1963 ), Strigamia maritima has a body fl uid OP of 462 mOsm.kg -<br />
<strong>and</strong> a Na + level 274 mM.l -1 <strong>and</strong> Hydroschendyla submarina 498 mOsm.kg - <strong>and</strong> 283<br />
mM.l -1 which are only slightly higher than <strong>the</strong> terrestrial Stigmatogaster subterranea<br />
(Shaw, 1789) with 438 mOsm.kg - <strong>and</strong> 205 mM.l -1 although higher than those of <strong>the</strong><br />
lithobiomorph Lithobius forfi catus at 370 mOsm.kg - <strong>and</strong> 190 mM.l -1 (Little, 1983 ).<br />
Th ese levels are about half or slightly less than that of full seawater so that such <strong>littoral</strong><br />
animals will still need to have mechanisms for regulating body fl uid volume e.g.<br />
removal of excess ions by some mechanism. Alternatively, <strong>the</strong>y will need be able to<br />
tolerate changes of body fl uid concentration.<br />
For terrestrial <strong>centipedes</strong> with <strong>the</strong>ir incomplete waterproofi ng / limited spiracular<br />
closing mechanisms, dry air poses a threat of desiccation (as would seawater). Damp<br />
environments which <strong>the</strong>y normally tend to inhabit will pose <strong>the</strong> opposite threat of<br />
osmotic water uptake which seems to be dealt with by removal of water in <strong>the</strong> gut <strong>and</strong><br />
retention of ions. It is possible that <strong>the</strong> coxal gl<strong>and</strong>s may, in some way be involved in<br />
transporting (Little, 1983 ); see also <strong>the</strong> review of <strong>the</strong>se in Rosenberg ( 2009 ).
24 A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39<br />
<strong>Geophilomorph</strong> <strong>centipedes</strong>, both terrestrial <strong>and</strong> <strong>littoral</strong> have been shown to be<br />
more tolerant of immersion than lithobiomorphs (Hennings, 1903 Plateau, 1890 ).<br />
Schubart ( 1929 ) found that submerged specimens of Pachymerium ferrugineum<br />
(C.L.Koch,1835) from Germany survived 7-68 days at room temperature (16-18 o C)<br />
whilst Suomalainen ( 1939 ) reported 24-95 days at 19-27 o C <strong>and</strong> 68-178 days at 6-12 o C<br />
for Finnish animals. Binyon <strong>and</strong> Lewis ( 1963 ) reported on survival times for animals<br />
immersed in sea-water for Strigamia maritima , Hydroschendyla submarina<br />
Stigmatogaster subterranea with <strong>the</strong> latter having much reduced survival times compared<br />
with <strong>the</strong> two <strong>littoral</strong> species. Th e two halophiles were able to maintain <strong>the</strong>ir body<br />
fl uid concentrations more or less constant for 14 hours whilst in Stigmatogaste r this<br />
rose signifi cantly. Th ere appears to have been little subsequent work on osmoregulation<br />
in <strong>littoral</strong> <strong>centipedes</strong>.<br />
Gaseous exchange<br />
Unlike some spiders which are able to trap bubbles of air in <strong>the</strong>ir nests <strong>and</strong> use <strong>the</strong>se<br />
ei<strong>the</strong>r as a direct resource or as a physical gill or remain in air pockets trapped in some<br />
o<strong>the</strong>r way e.g. in empty barnacle shells (McQueen <strong>and</strong> McLay, 1983 ; Roth <strong>and</strong> Brown,<br />
1975 ; Rovner, 1987 ) <strong>the</strong>re is little clear evidence of geophilomorphs doing this even<br />
though Bonnel ( 1929 ) had reported that Mixophilus indicus (Silvestri, 1929 ) trapped a<br />
bubble of air in a loop in <strong>the</strong> posterior end of its body. Rajalu ( 1972 ) was unable to<br />
confi rm this <strong>and</strong> as Lewis ( 1962 ) pointed out, although newly immersed specimens of<br />
Strigamia maritima have bubbles of air on <strong>the</strong>ir surface <strong>the</strong>se are likely to be rapidly<br />
dispersed by movement. Nor is <strong>the</strong>re any evidence of <strong>centipedes</strong> occupying air fi lled<br />
burrows. However <strong>the</strong>re have been suggestions that air bubbles could be trapped in<br />
spiracles <strong>and</strong> might act as physical gills (Laloy, 1904 ; Suomalainen, 1939 ) <strong>and</strong> <strong>the</strong>re is<br />
some evidence for this (Lewis, 1960).<br />
Alternatively ei<strong>the</strong>r <strong>the</strong> general body surface or some part of it might allow gaseous<br />
exchange directly with sea water (Rajalu, 1972 ). Manton ( 1965 ) argued that closure of<br />
<strong>the</strong> spiracular atrium when burrowing allowed respiration to continue <strong>and</strong> that <strong>the</strong><br />
atrial cuticle facilitated respiration under wet soil (<strong>and</strong> hence, possibly, sea water)<br />
conditions.<br />
Tolerance of more or less severe hypoxia in insects (which would be advantageous<br />
during submergence) is greater than in most vertebrates (Hoback <strong>and</strong> Stanley, 2001 ;<br />
Schmitz <strong>and</strong> Harrison, 2004 ) <strong>and</strong> <strong>the</strong> apparent capacity of at least some <strong>centipedes</strong> to<br />
build up an oxygen debt which is subsequently “paid off ” is indicated by experiments<br />
with Mixophilus indicus (Rajalu, 1970 ). A similar phenomenon has been found when<br />
measuring oxygen consumption in <strong>the</strong> terrestrial lithobiomorph Lithobius agilis (Ivan<br />
Kos, pers. comm.)<br />
Problems of defi ning halophiles<br />
One of <strong>the</strong> problems associated with gaining a clear picture of <strong>the</strong> variety <strong>and</strong> numbers<br />
of shoreline animal species is that of defi nition of <strong>the</strong> terms “<strong>littoral</strong>” <strong>and</strong> “sea shore”<br />
which, in some accounts, can include areas of l<strong>and</strong> close to <strong>the</strong> beach itself. For instance,<br />
<strong>and</strong>
A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39 25<br />
Ivinskis <strong>and</strong> Rimšaitė ( 2005 ) in a study of <strong>the</strong> Curonian Spit <strong>and</strong> Klaipėda-Šventoji<br />
zone refer to “seashore <strong>habitat</strong>s” in which <strong>the</strong>y included dunes, dry grassl<strong>and</strong>s <strong>and</strong> s<strong>and</strong><br />
heaths (<strong>and</strong> recorded 2,000 species of insects). Correspondingly “Littoral Méditerranéan”<br />
as used by Brölemann ( 1930 ) when describing some geophilomorph species seems to<br />
refer to that particular region of France ra<strong>the</strong>r than to specifi cally <strong>littoral</strong> <strong>habitat</strong>s as we<br />
might underst<strong>and</strong> <strong>the</strong>m.<br />
In this account we will take <strong>the</strong> term to refer to species found in locations close to<br />
high water line <strong>and</strong> below. Including <strong>the</strong> supra<strong>littoral</strong> zone would substantially increase<br />
<strong>the</strong> number of species as more “terrestrial” forms are found but <strong>the</strong> line between <strong>littoral</strong><br />
<strong>and</strong> supra-<strong>littoral</strong> species is necessarily blurred. Lewis ( 1962 ), when describing <strong>the</strong><br />
ecology, distribution <strong>and</strong> taxonomy of <strong>the</strong> <strong>centipedes</strong> on <strong>the</strong> shore in <strong>the</strong> Plymouth<br />
area, includes four species that we might regard as typically <strong>littoral</strong> [ Hydroschendyla<br />
submarina , Schendyla peyerimhoffi (Brölemann <strong>and</strong> Ribaut, 1911), Strigamia maritima ,<br />
Geophilus seurati (Brölemann, 1924; Figure 4 )], a species which occurs both on <strong>and</strong> off<br />
<strong>the</strong> shore ( Geophilus fl avus ) <strong>and</strong> one, Stenotaenia linearis (C. L. Koch, 1835), which is<br />
usually regarded as terrestrial <strong>and</strong> was found at high water mark.<br />
In addition to <strong>the</strong> problem of defi nition, <strong>littoral</strong> <strong>habitat</strong>s are, by <strong>the</strong>ir nature, often<br />
diffi cult to sample, whe<strong>the</strong>r shingle, saltmarsh, s<strong>and</strong>, mud, mangroves or transitory<br />
drift lines <strong>and</strong> in addition to <strong>the</strong> physical diffi culties in extracting <strong>littoral</strong> species from<br />
<strong>the</strong>ir substrate some appear to have discontinuous distribution patterns <strong>and</strong> even<br />
within a particular location, possibly because of micro-variation in environmental<br />
conditions, <strong>the</strong>y may show a patchy occurrence. Th ese toge<strong>the</strong>r with tidal, seasonal or<br />
Figure 4. Geophilus seurati Brölemann, 1924 (= G.gracilis Meinert, 1898) from under a stone on a salt<br />
marsh, Gower Peninsula, Wales.
26 A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39<br />
wea<strong>the</strong>r induced local migration can sometimes make it surprisingly diffi cult to fi nd<br />
<strong>littoral</strong> species in apparently suitable sites.<br />
Categories of halophiles<br />
Th ere are clearly <strong>and</strong> distinctly recognised halophilic species such as <strong>the</strong> European<br />
Hydroschendyla submarina which are only found on shores below or around high water<br />
line <strong>and</strong> which will be likely to experience submersion at high tide but species found<br />
on <strong>the</strong> shore may also include typical “terrestrial” ones that happen also to occur sometimes<br />
on <strong>the</strong> shore during chance foraging but are not specifi cally associated with it<br />
<strong>and</strong> this could include a very wide range of types. Th ere are also species that do commonly<br />
occur on <strong>the</strong> shore <strong>and</strong> are characteristically found <strong>the</strong>re but also occur inl<strong>and</strong><br />
such as Pachymerium ferrugineum widespread across Europe <strong>and</strong> elsewhere but regularly<br />
found in beach shingle or o<strong>the</strong>r <strong>littoral</strong> sites e.g. in Finl<strong>and</strong> (Palmén, 1949 ).<br />
Silvestri ( 1903 ) distinguished <strong>the</strong>se three categories as miriopodi halofi li genuini ,<br />
miriopodi halofi li accidentali <strong>and</strong> miriopodi halofi li indiff erenti <strong>and</strong> <strong>the</strong>se remain useful<br />
concepts. Unfortunately <strong>the</strong>re are many species described which, one suspects, could<br />
be <strong>littoral</strong> but lack detailed <strong>habitat</strong> data. Th ere are o<strong>the</strong>rs where <strong>the</strong>re are so few records,<br />
possibly only a single one so that it is impossible to which of Silvestri’s categories <strong>the</strong><br />
apparently <strong>littoral</strong> species might be allocated. Th ere are also animals which appear to<br />
be genuine halophiles in one region but have been found inl<strong>and</strong> elsewhere. Examples<br />
of <strong>the</strong> latter include Schendyla peyerimhoffi <strong>and</strong> Schendyla monodi (Brölemann, 1924),<br />
both apparently exclusively halophilic in NW Europe but which have been recorded<br />
inl<strong>and</strong> in Iberia.<br />
Th e range of species <strong>and</strong> <strong>the</strong>ir known geographical distribution<br />
Littoral geophilomorphs, whe<strong>the</strong>r genuini , indiff erent i or possibly accidentali have<br />
been described from many seashores, sometimes only once but <strong>the</strong>re are areas of <strong>the</strong><br />
world such as much of Asia, sub-Saharan Africa <strong>and</strong> <strong>the</strong> Atlantic coast of North<br />
America which are poor in known species, possibly due to lack of collection <strong>and</strong> identifi<br />
cation from suitable sites or lack of suitable <strong>habitat</strong>s. Th e present list ( Tables 1, 2a,<br />
<strong>and</strong> 2b ) is based on <strong>the</strong> literature, mostly as summarised with <strong>the</strong> relevant references in<br />
a previous paper by <strong>the</strong> present author (Barber, 2009a ) where are also listed o<strong>the</strong>r possible<br />
<strong>littoral</strong> species for which <strong>the</strong>re is inadequate <strong>habitat</strong> data. In <strong>the</strong> tables <strong>the</strong> probable<br />
status is indicated on <strong>the</strong> basis of known ecological data (G = genuini , I = indiff erenti ,<br />
R = <strong>littoral</strong> in one region, inl<strong>and</strong> in ano<strong>the</strong>r) but it is quite possible that some of <strong>the</strong><br />
myriopodi halofi li genuini may turn out to be indiff erenti or even accidentali .<br />
It is also possible that not all species names are valid ei<strong>the</strong>r because of synonymy or<br />
lack of clarity as to whe<strong>the</strong>r <strong>the</strong> name is being correctly applied. In an example of <strong>the</strong><br />
latter, Chamberlin ( 1909 ) described a new species Pectiniunguis heathi (now known as<br />
Nyctunguis heathi ) as up to 22mm <strong>and</strong> from a shell mound near Cypress Point, Montery<br />
County, California without actually indicating whe<strong>the</strong>r this was a shoreline site.
A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39 27<br />
Table 2a. Littoral geophilomorph species <strong>and</strong> <strong>the</strong>ir recorded distribution: Families Mecistocephalidae,<br />
Schendylidae, Ballophilidae, Linotaeniidae, Dignathodontidae, <strong>and</strong> Aphilodontidae. Based on data in<br />
Barber, 2009a.<br />
FAMILY <strong>and</strong> Species Distribution Status Note<br />
MECISTOCEPHALIDAE<br />
Mecistocephalus manazuensis Shinohara, 1961 Japan ? I 1<br />
Mecistocephalus satumensis Takano, 1980<br />
SCHENDYLIDAE<br />
Japan G<br />
Hydroschendyla submarina Grube, 1872 Mediterranean, N.Atlantic<br />
(Sc<strong>and</strong>inavia–N.Africa),<br />
Bermuda<br />
G<br />
Nyctunguis heathi (Chamberlin, 1909 ) California ?G 2<br />
Pectiniunguis albermarlensis Chamberlin, 1914 Galápagos Isl<strong>and</strong>s I<br />
Pectiniunguis americanus Bollman, 1889 Gulf of California ?I<br />
Pectiniunguis amphibius Chamberlin, 1923 Gulf of California, Florida,<br />
Mexico<br />
G<br />
Pectiniunguis bollmani Pereira et al, 1999 Venezuela G<br />
Pectiniunguis halirrhytus Crabil, 1959 Florida, Mexico G<br />
Pectiniunguis krausi Shear <strong>and</strong> Peck, 1992 Galápagos Isl<strong>and</strong>s I<br />
Schendyla monodi (Brölemann, 1924) France<br />
Inl<strong>and</strong> in Spain<br />
R 3<br />
Schendyla peyerimhoffi (Brölemann <strong>and</strong> Great Britain, Irel<strong>and</strong>, France R<br />
Ribaut, 1911)<br />
Inl<strong>and</strong> in Portugal, Algeria<br />
Schendylops virgingordae Crabill, 1960 Virgin Gorda, Martinique,<br />
Venezuela<br />
G<br />
Th indyla <strong>littoral</strong>is (Kraus, 1954)<br />
BALLOPHILIDAE<br />
Peru G<br />
Ballophilus riveroi Chamberlin, 1950 Tortola (W.I.) ?I 4<br />
Caritohallex minirrhopus Crabill, 1960<br />
LINOTAENIIDAE<br />
Tortola (W.I.) G<br />
Strigamia maritima (Leach, 1817 ) Sc<strong>and</strong>inavia – N. France<br />
Great Britain <strong>and</strong> Irel<strong>and</strong><br />
G<br />
Strigamia japonica (Verhoeff , 1935 )<br />
DIGNATHODONTIDAE<br />
Japan G<br />
Henia bicarinata (Meinert, 1870)<br />
APHILODONTIDAE<br />
Mediterranean, Macaronesia,<br />
Canary Isl<strong>and</strong>s<br />
I<br />
Aphilodon maritimus (Lawrence, 1963) South Africa ?G 5<br />
Status: G = genuini , I = indiff erenti , R = <strong>littoral</strong> in one region, inl<strong>and</strong> in ano<strong>the</strong>r.<br />
Notes:<br />
1. May be synonymous with M. nannocornis Chamberlin, 1920, most records of which are non-coastal<br />
(Uliana et al., 2007 ).<br />
2. See comment about this species.<br />
3. May be synonymous with S. viridis (Verhoeff , 1951).<br />
4. Male agreeing with this description collected at same time by same method as C. minirrhopus.<br />
5. Included on basis of name <strong>and</strong> location but not specifi cally identifi ed as <strong>littoral</strong>.
28 A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39<br />
Table 2b. Littoral geophilomorph species <strong>and</strong> <strong>the</strong>ir recorded distribution: Family Geophilidae. Based on<br />
data in Barber, 2009a <strong>and</strong> named sources.<br />
Species Distribution Status Note<br />
Erithophilus neopus Cook, 1889 Florida ?I 1<br />
Geophilus admarinus Chamberlin, 1952 Alaska G<br />
Geophilus algarum Brölemann, 1909 France (north <strong>and</strong> west coasts) G 2<br />
Geophilus becki Chamberlin, 1951 California G<br />
Geophilus fl avus (De Geer, 1778) Widespread in Europe,<br />
Newfoundl<strong>and</strong>, North America<br />
I<br />
Geophilus fucorum Brolemann, 1909 Mediterranean G 2<br />
Geophilus proximus C.L. Koch, 1847 Central <strong>and</strong> Nor<strong>the</strong>rn Europe<br />
Fennosc<strong>and</strong>ia, White Sea<br />
3<br />
Geophilus pusillifrater Verhoeff , 1898 Great Britain, Irel<strong>and</strong>, Brittany<br />
Inl<strong>and</strong> in Herzegovina<br />
R 4<br />
Geophilus seurati Brölemann, 1924 Great Britain, Irel<strong>and</strong>, Brittany<br />
G 2, 5<br />
(= G. gracilis Meinert, 1898)<br />
Mediterranean (North Africa), USA<br />
Geophilus terranovae Palmén, 1954 Newfoundl<strong>and</strong> 6<br />
Lionyx hedgepethi Chamberlin, 1960 California G<br />
Maoriella ecdema Crabill, 1964 Chatham Isl<strong>and</strong> (New Zeal<strong>and</strong>) ?G 7<br />
Mixophilus indicus (Silvestri, 1929 ) India G<br />
Pachymerium ferrugineum<br />
Europe, North Africa, Taiwan,<br />
I 8<br />
(C.L.Koch, 1835)<br />
Hawai’i, Japan, North America, etc.<br />
Polycricus bredini (Crabill, 1960 ) Tortola (West Indies) ?G 9<br />
Tretecthus uliginosus (von Porat, 1894) Cameroun G<br />
Tuoba ashmoleorum (Lewis, 1996 ) Ascension Isl<strong>and</strong> ?G<br />
Tuoba japonicus (Fahl<strong>and</strong>er, 1934) Japan G<br />
Tuoba kozuensis Takakuwa, 1934 Japan G<br />
Tuoba laticeps Pocock, 1901 Australia (Western Australia, Tasmania) G<br />
Tuoba <strong>littoral</strong>is (Takakuwa, 1934) Japan G<br />
Tuoba pallida Jones, 1998 Western Australia G<br />
Tuoba posedonis (Verhoeff , 1901) Mediterranean, Dead Sea, Red Sea G<br />
Tuoba sudanensis (Lewis, 1963) Sudan G<br />
Tuoba sydneyensis (Pocock, 1891) Australia, New Caledonia, New Britain, G / I 10<br />
Solomon Isl<strong>and</strong>s, Hawai’i<br />
Tuoba tiosanus Takakuwa, 1934 Japan, Micronesia ?G<br />
Tuoba xylophaga (Attems, 1903) New Zeal<strong>and</strong> G<br />
Status: G = genuini , I = indiff erenti , R = <strong>littoral</strong> in one region, inl<strong>and</strong> in ano<strong>the</strong>r.<br />
Notes:<br />
1. Included on advice of L. A. Pereira.<br />
2. See comment about <strong>the</strong>se species.<br />
3. Littoral in Fennosc<strong>and</strong>ia (Palmén, 1949 ), White Sea (along with P. ferrugineum ; Prziboro, 1994 <strong>and</strong><br />
pers. comm.).<br />
4. Described originally from inl<strong>and</strong> site in Herzegovina.<br />
5. Th ere is a record of Geophilus gracilis from New Haven, Connecticut (Harger, 1872 ).<br />
6. A number of seashore records, mostly or entirely above high water mark (Palmén, 1954 ).<br />
7. Under stones, high water mark (Crabill, 1964 ).<br />
8. Pachymerium idium Chamberlin, 1960 was taken in a rock fi ssure kept moist by spray but not covered<br />
by high tide, California (Chamberlin, 1960 ).<br />
9. Berlese sifting of beach drift.<br />
10. Occurs up to 950m in Hawai’i.
A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39 29<br />
Evans ( 1980 ) in an accounts of <strong>littoral</strong> arthropods from California describes this species<br />
as occurring “in crevices <strong>and</strong> on <strong>the</strong> surfaces of rocks at night during low tide” <strong>and</strong><br />
up to 45 mm long <strong>and</strong> in a similar record of its occurrence on <strong>the</strong> shore by Ricketts et<br />
al ( 1985 ) it is described as “common”. A photograph in <strong>the</strong> book Living Invertebrates<br />
(Pearse et al, 1987 ) shows a 50 mm specimen identifi ed as N. heathi . In relation to this,<br />
Hoff man <strong>and</strong> Carlton ( 2007 ) commented that “Th e identifi cation of any schendylid<br />
should be approached with caution however <strong>and</strong> <strong>the</strong> identity of Chamberlin’s species<br />
with intertidal <strong>centipedes</strong> may bear re-examination”.<br />
In <strong>the</strong> case of Geophilus fucorum Brölemann, 1909, Geophilus seurati Brölemann,<br />
1924 (= Geophilus fucorum seurati Brölemann, 1924, also known as G. gracilis Meinert,<br />
1898), Geophilus algarum Brölemann, 1909, <strong>and</strong> G. algarum decipiens Brölemann,<br />
1930 , <strong>the</strong>re are issues relating to taxonomy / nomenclature <strong>and</strong> to variability within<br />
<strong>and</strong> this group (Lewis, 1962 ) <strong>and</strong> examination of fur<strong>the</strong>r specimens from both <strong>the</strong><br />
British <strong>and</strong> French coasts would be helpful.<br />
Orphnaeus brevilabiatus (Newport, 1845) (Family Oryidae) is included in a list of<br />
<strong>littoral</strong> species by Roth <strong>and</strong> Brown ( 1976 ) who quote Crabill (pers.comm.) describing<br />
it as being found in “cocoon-like structures” on twigs fl oating or awash on beaches.<br />
It is a species widespread in <strong>the</strong> tropics <strong>and</strong> if this is <strong>the</strong> case <strong>the</strong>n this might be a way<br />
in which it is dispersed <strong>and</strong> it might be considered an indiff erent halophile.<br />
Stigmatogaster subterranea (Family Himantariidae) a north-west <strong>and</strong> central European<br />
terrestrial <strong>and</strong> often synanthropic species has sometimes been found on <strong>the</strong> upper<br />
shore in company with Strigamia maritima or Geophilus seurati on <strong>the</strong> western coast of<br />
Great Britain (personal observations) ( Figure 3 ). Th is is despite <strong>the</strong> fact that it has a low<br />
survival time in seawater (Binyon <strong>and</strong> Lewis, 1963 ).<br />
Hydroschendyla submarina occurs on <strong>the</strong> eastern Atlantic coast from Sc<strong>and</strong>inavia to<br />
North Africa in crevices at or below high water mark <strong>and</strong> in <strong>the</strong> Mediterranean (France,<br />
Greece, Italy <strong>and</strong> North Africa) from where it is recorded under str<strong>and</strong>ed remains of<br />
Posidonia <strong>and</strong> near salt marshes. It is also known from Bermuda in crevices in <strong>the</strong> upper<br />
intertidal <strong>and</strong> low supra-<strong>littoral</strong>. Lewis ( 1962 , 1981 ) contrasted its behaviour with that<br />
of Strigamia maritima <strong>and</strong> also showed that, having eggs impermeable to sea water<br />
allowed both moulting <strong>and</strong> egg laying in <strong>the</strong> <strong>littoral</strong> zone.<br />
Strigamia maritima is recorded from <strong>the</strong> coasts of Sc<strong>and</strong>inavia, Germany, Ne<strong>the</strong>rl<strong>and</strong>s,<br />
Belgium, Britain, Irel<strong>and</strong> <strong>and</strong> nor<strong>the</strong>rn France. Bergesen et al. (2006) recorded it for<br />
<strong>the</strong> fi rst time for North Norway (under stones in <strong>the</strong> supra<strong>littoral</strong> amongst isopods,<br />
Porcellio scaber ) whilst Hornel<strong>and</strong> <strong>and</strong> Meidell ( 1986 ) were able to collect “several<br />
thous<strong>and</strong>s of specimens” from an isl<strong>and</strong> north of Bergen. It is often extremely abundant<br />
in favourable situations with large numbers under individual stones, a situation<br />
that seems to be paralleled by Geophilus becki according to Habermann (1982). Habitats<br />
for S.maritima include shingle, under rocks <strong>and</strong> stones <strong>and</strong> in rock crevices. Th e life<br />
history <strong>and</strong> ecology of this species was studied by Lewis (1960, 1961 ) who related its<br />
behaviour <strong>and</strong> its tolerance of seawater at diff erent stages of its life history to it being a<br />
mobile species, concentrating in areas that are climatically favourable <strong>and</strong> have a good<br />
food supply <strong>and</strong> to its breeding season <strong>and</strong> its ability to migrate up <strong>and</strong> down beaches.
30 A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39<br />
Pachymerium ferrugineum is cited as having coastal areas <strong>and</strong> particularly seashores<br />
as a “preferred” <strong>habitat</strong> at least in nor<strong>the</strong>rn Europe but certainly not being an exclusive<br />
shore species <strong>and</strong> with a wide ecological range, found up to 2,800m asl in <strong>the</strong> Hoggar<br />
Mountains in <strong>the</strong> Sahara (Palmén <strong>and</strong> Rantala, 1954 ). It is possibly one of <strong>the</strong> most<br />
widespread <strong>centipedes</strong> in <strong>the</strong> world <strong>and</strong> is known from Sc<strong>and</strong>inavia, Ne<strong>the</strong>rl<strong>and</strong>s,<br />
Belgium, France, Iberia, Mediterranean region including North Africa, Asia Minor,<br />
Caucasus, Azores, Canaries, Madeira, Taiwan, Japan, Hawai’i, Juan Fern<strong>and</strong>ez, Mexico,<br />
USA, Canada, Alaska, etc. Th ese are certainly not all <strong>littoral</strong> sites <strong>and</strong> in some places<br />
it is no doubt present because of accidental human introduction but its physiological<br />
tolerance certainly suggests <strong>the</strong> possibility of “natural” expansion of its range e.g. by<br />
oceanic rafting to isolated isl<strong>and</strong>s <strong>and</strong> coastal locations. Mediterranean records include<br />
a variety of <strong>habitat</strong>s including <strong>the</strong> seashore <strong>and</strong> in wrack. In <strong>the</strong> Black Sea (Bulgaria) it<br />
is recorded (as var. insulanum ) from under stones, algae <strong>and</strong> Zostera .<br />
In nor<strong>the</strong>rn <strong>and</strong> western Europe its distribution is interesting. It is known from<br />
Norway, Sweden, Finl<strong>and</strong> <strong>and</strong> Denmark <strong>and</strong> from <strong>the</strong> White Sea coast as well as inl<strong>and</strong><br />
in NE Europe. In Eastern Fennosc<strong>and</strong>ia records include from under stones, in decaying<br />
Fucus <strong>and</strong> o<strong>the</strong>r debris on seashores as well as from dry terrestrial sites (Palmén,<br />
1949 ). Meidell ( 1979 ) drew attention to <strong>the</strong> fact that this species <strong>and</strong> Strigamia maritima<br />
form an “east-west pair of species” with S. maritima along <strong>the</strong> western coast <strong>and</strong><br />
P. ferrugineum along <strong>the</strong> eastern coast of sou<strong>the</strong>rn Norway <strong>and</strong> a zone of overlap in<br />
both <strong>the</strong> north <strong>and</strong> south. Bergersen et al . ( 2006 ) did not list it for north Norway. Th e<br />
maps for <strong>the</strong> two species in <strong>the</strong> Encyclopedia of <strong>the</strong> Swedish Fauna <strong>and</strong> Flora (Andersson<br />
et al. , 2005 ; pp. 165 <strong>and</strong> 169) highlight this pattern in <strong>the</strong> Nordic countries.<br />
All records from <strong>the</strong> Ne<strong>the</strong>rl<strong>and</strong>s <strong>and</strong> Belgium appear to be from inl<strong>and</strong> sites<br />
(Berg et al., 2008 , Lock, 2009 ). It has described as widely distributed in France <strong>and</strong><br />
Corsica <strong>and</strong> favouring <strong>the</strong> seashore “without being strictly halobiontic or highly halophilous”<br />
(Geoff roy <strong>and</strong> Iorio, 2009) but <strong>the</strong> only record from <strong>the</strong> nor<strong>the</strong>rn coastal area<br />
seems to be from a seashore dune in Brittany (Iorio, 2005 ). Th e three British records<br />
are all from beach shingle (Barber, 2009b ). Th is would suggest that in this area of<br />
Western Europe it is very much on <strong>the</strong> edge of its European range <strong>and</strong> that maybe<br />
competition with each o<strong>the</strong>r in some way restricts <strong>the</strong> range of P. ferrugineum<br />
<strong>and</strong> S. maritima . Interestingly, Andersson ( 1983 ) noted a substantial decrease in<br />
P. ferrugineum in open rocky terrain, on seashores <strong>and</strong> <strong>the</strong> Nor<strong>the</strong>rn Skerries between<br />
<strong>the</strong> 1920s <strong>and</strong> <strong>the</strong> 1970s in <strong>the</strong> vicinity of Göteborg (Sweden). No explanation of this<br />
decline was suggested.<br />
Characteristics of <strong>littoral</strong> geophilomorphs<br />
Examination of <strong>the</strong> range of <strong>littoral</strong> <strong>Geophilomorph</strong>a reveals an extremely diverse<br />
group of species. For instance, bearing in mind that most measurements are based on<br />
preserved material, recorded body lengths for <strong>littoral</strong> forms vary from 10mm ( Caritohallex<br />
minirrhopus ) to 55mm ( Th indyla <strong>littoral</strong>is , Henia bicarinata ;) <strong>and</strong> leg-bearing<br />
segments from 39 ( Schendyla peyerimhoffi , C. minirrhopus ) to 85 ( H.bicarinata ).
A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39 31<br />
Th e actual number of leg-bearing segments varies slightly as between sexes <strong>and</strong> within<br />
most species (apart from mecistocephalids) but remains constant throughout life. Body<br />
colour varies between pale / semi-transparent through various shades of yellow <strong>and</strong><br />
orangish to reddish-brown with head region often a somewhat darker although colours<br />
often fade in preserved specimens. Mixophilus indicus was described as “light lea<strong>the</strong>r<br />
coloured” by Silvestri ( 1929 ).<br />
Crabill ( 1968 ) drew attention to <strong>the</strong> fact that in <strong>the</strong> genus Tuoba (Geophilidae)<br />
which contains a number of <strong>littoral</strong> species <strong>the</strong>re was a long <strong>and</strong> spiniform pre-tarsal<br />
anterior parunguis (spine) on <strong>the</strong> legs which he regarded as associated with <strong>the</strong> genus’s<br />
distinctively <strong>littoral</strong> preferences <strong>and</strong> which, he suggested, probably functioned as a<br />
special hold-fast adaptation to which Lewis ( 1996 ) added <strong>the</strong> comment that it would<br />
also be useful during transportation. Pereira et al. ( 1999 ) reported on a similar structure<br />
in Pectiniunguis (Schendylidae). O<strong>the</strong>r than this, across <strong>the</strong> various species <strong>and</strong> families,<br />
<strong>the</strong>re seem to be few common characteristics that are obviously related to a <strong>littoral</strong><br />
lifestyle <strong>and</strong> even within a single family <strong>the</strong>re may be marked diff erences between different<br />
<strong>littoral</strong> forms. For instance, in <strong>the</strong> Schendylidae, Hydroschendyla submarina is a<br />
relatively robust reddish brown form up to 40mm long, Schendyla peyerimhoffi is pale<br />
yellow <strong>and</strong> up to 18mm whilst Th indyla <strong>littoral</strong>is is described as yellowish with head<br />
orange <strong>and</strong> up to 55mm long. Closer examination <strong>and</strong> comparison might, perhaps,<br />
identify common features shared by many or all <strong>littoral</strong> forms.<br />
Dispersal <strong>and</strong> isolation<br />
Th eir present world distribution of <strong>littoral</strong> “terrestrial” arthropods such as geophilomorphs,<br />
with often widespread genera <strong>and</strong> species, <strong>the</strong>ir occurrence on isolated isl<strong>and</strong>s<br />
<strong>and</strong> <strong>the</strong>ir presence on both sides of oceans could be accounted for by a number of possible<br />
explanations including continental drift, climate change, transport by birds or<br />
o<strong>the</strong>r animals aerial dispersal, human activity <strong>and</strong> passive transport by water.<br />
With Neotropical geophilomorphs <strong>the</strong>re are suggestions that a few taxa have <strong>the</strong><br />
traits of an old Gondwanan faunal element but <strong>the</strong> bulk of <strong>the</strong> group belong to wideranging<br />
groups, possibly recent immigrants to South America (Pereira et al., 1997 ).<br />
Verhoeff ( 1935 ) when fi rst describing Strigamia japonica , suggested that <strong>the</strong>re might<br />
have once been a continuous occurrence of Strigamia along <strong>the</strong> Siberian coast during<br />
<strong>the</strong> last warm period, later broken up by climate change leading to <strong>the</strong> separation of<br />
<strong>the</strong> European <strong>and</strong> Asian maritime forms.<br />
Transport by birds has been suggested for certain freshwater millipedes (Golovatch<br />
<strong>and</strong> Kime, 2009 ) but <strong>the</strong>re is no defi nite evidence of this being a common mechanism<br />
for dispersing <strong>littoral</strong> arthropods. Also small organisms are always at risk of aerial transport<br />
as dust, etc. is picked up <strong>and</strong> carried in <strong>the</strong> atmosphere, possibly for long distances<br />
but, again, this is probably unlikely for <strong>littoral</strong> <strong>centipedes</strong>. Dispersal by human activity<br />
(anthropochory) is always seen as a way by which animals <strong>and</strong> plants are spread around<br />
<strong>the</strong> world <strong>and</strong> many animals seem to have been dispersed in this way, as for instance,<br />
North American invertebrates (Lindroth, 1957 ), Newfoundl<strong>and</strong> <strong>centipedes</strong> (Palmén,
32 A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39<br />
1954 ) <strong>and</strong> <strong>the</strong> myriapods of St.Helena (Matic <strong>and</strong> Darabantu, 1977 ) all of which<br />
include European species. Crabill ( 1964 ) thought that Maoriella edentatus (Attems,<br />
1947) described from Tahiti (no locality details) might possibly be an aberrant<br />
Maoriella macrostigma Attems 1903 transported from New Zeal<strong>and</strong> by early Polynesian<br />
voyagers; Maoriella is a genus known o<strong>the</strong>rwise only from New Zeal<strong>and</strong> with one species<br />
from Australia. “Terrestrial” (especially soil) animals, especially those associated<br />
with agriculture or similar practices, would seem to be likely to be spread this way<br />
ra<strong>the</strong>r than sea shore organisms although <strong>the</strong> possibility of <strong>the</strong> latter being carried in<br />
ship’s ballast should not be forgotten.<br />
Accidental dispersal by rafting of animals e.g. on plant debris (hydrochory) is certainly<br />
seen as a likely dispersal mechanism, for animals <strong>and</strong> <strong>littoral</strong> species are in an<br />
optimum situation for this, both in terms of being accidentally carried away <strong>and</strong> of<br />
establishing <strong>the</strong>mselves when <strong>the</strong>y arrive at a suitable destination. Suomalainen ( 1939 )<br />
had reported on Pachymerium ferrugineum fl oating on sea water for as long as 31 days<br />
before sinking <strong>and</strong> long survival when submerged in such water. Anecdotally, Nesrine<br />
Akkari ( pers. comm .) described how a live Pachymerium ferrugineum was taken directly<br />
in a l<strong>and</strong>ing net from <strong>the</strong> water in a shallow lagoon in Tunisia by a colleague who was<br />
collecting mosquito larvae. Interestingly, this species is probably tone of <strong>the</strong> most widespread<br />
<strong>centipedes</strong> in <strong>the</strong> world. Fossil evidence suggests that rafting occurred in palaeooceans<br />
<strong>and</strong> during recent centuries <strong>the</strong> composition <strong>and</strong> abundance of fl oating items<br />
has been strongly aff ected by human activities; it is suggested that rafting continues to<br />
be an important dispersal in present-day oceans (Th iel <strong>and</strong> Gutow, 2004 ).<br />
Th ere is, in fact, very limited quantitative data on <strong>the</strong> extent to which even insects<br />
actually survive as drifters <strong>and</strong> most studies on animals spreading by rafting concentrate<br />
on marine species (e.g. Th iel <strong>and</strong> Gutow, 2005 ). Drifting vegetation has been<br />
found up to 16km off shore which supported many insects although only 25% of it had<br />
living terrestrial animals <strong>and</strong> no living insects were found in vegetation collected 160km<br />
off shore (although colonies of ants have been reported in drifting wood) (Bowden <strong>and</strong><br />
Johnson, 1976 ). Even if <strong>the</strong> chances of survival are small, <strong>the</strong> possibility remains for<br />
transport in this way. Th e pseudoscorpion Apocheiridium pelagicum Redikorzev, 1938<br />
was fi rst collected 200 miles (320km) at sea in plankton nets; its <strong>habitat</strong> is in reefs<br />
constantly submerged by <strong>the</strong> sea (Roth <strong>and</strong> Brown, 1976 ). Th e fact that heteropterous<br />
bugs ( Halobates spp.) can live on <strong>the</strong> surface of <strong>the</strong> open ocean suggests also that <strong>the</strong>re<br />
is no fundamental reason why arthropods of terrestrial origin should not be able to<br />
survive in this environment for a period of time <strong>and</strong> be dispersed over wide distances.<br />
Crabill ( 1960 ) discussed <strong>the</strong> issue of rafting as a means of distribution of <strong>centipedes</strong><br />
referring to Caritohallex minirrhopus , Balophilus riveroi <strong>and</strong> Schendylus virgingordae collected<br />
in West Indian beach drift <strong>and</strong> to specimens of Pectiniunguis from seaweed on a<br />
beach in Florida Key. He thought that animals might not be “discomfi ted much or at<br />
all perhaps” in <strong>the</strong> wood or under <strong>the</strong> bark of fl oating trees or bushes <strong>and</strong> suggesting<br />
that, although many, perhaps <strong>the</strong> majority, would perish, over <strong>the</strong> immense length of<br />
time <strong>and</strong> <strong>the</strong> millions of such voyages that were begun, many must have reached l<strong>and</strong><br />
<strong>and</strong> survived. He went on to comment that “during <strong>the</strong> immense stretches of time of<br />
<strong>the</strong> past some <strong>centipedes</strong> – <strong>the</strong>y may well have been Schendylidae – made <strong>the</strong> journey
A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39 33<br />
successfully <strong>and</strong> this explanation reasonably accounts for <strong>the</strong> presence in Africa <strong>and</strong><br />
South America of many, but of course not all, congeneric or conspecifi c <strong>centipedes</strong>”.<br />
Th is hypo<strong>the</strong>sis was supported by Pereira <strong>and</strong> Minelli ( 1993 ) <strong>and</strong> Pereira et al. ( 1997 ),<br />
<strong>the</strong> latter writing “Th ere is a single specimen of Schendylops in <strong>the</strong> Natural History<br />
Museum in London, too damaged for allow for confi dent specifi c identifi cation, but<br />
good enough to allow a confi dent identifi cation as a member of a genus occurring,<br />
with many species, on both sides of <strong>the</strong> Atlantic. Th is specimen was collected long ago<br />
from Ascension Isl<strong>and</strong>, midway between Africa <strong>and</strong> South America, along <strong>the</strong> route<br />
of <strong>the</strong> westbound South Equatorial Current”.<br />
On both a local <strong>and</strong> a global scale, <strong>the</strong> varied nature of coasts will be likely to break<br />
up species into a series of isolated populations which would favour genetic divergence.<br />
Dispersal across oceans <strong>and</strong> to isolated isl<strong>and</strong>s would accentuate this eff ect. Th is may<br />
be refl ected in variations in characters between populations at diff erent sites.<br />
<strong>Geophilomorph</strong>s are convenient animals in which to study such diff erences by looking<br />
at variation of numbers of leg-bearing segments at particular locations as described by<br />
Lewis ( 1962 ) for Strigamia maritima <strong>and</strong> Shinohara ( 1961 ) for Tuoba <strong>littoral</strong>is . Arthur<br />
<strong>and</strong> Kettle ( 2000 ) demonstrated a latitudinal cline in segment number in Strigamia<br />
maritima in Britain, suggesting that climatic selection <strong>and</strong> local adaptation could be<br />
responsible; Vedel et al. ( 2008 ) showed that, in laboratory experiments, temperature<br />
regime infl uences <strong>the</strong> number of leg-bearing segments that develop in this species <strong>and</strong><br />
which could provide an explanation for this phenomenon.<br />
Conclusions<br />
It can be seen that <strong>the</strong>re is a wide diversity of species of <strong>littoral</strong> <strong>centipedes</strong> around <strong>the</strong><br />
world but with obvious <strong>and</strong> sometimes surprising gaps in our knowledge including <strong>the</strong><br />
shortage of records from <strong>the</strong> coasts of eastern North America, most of Africa including<br />
South Africa <strong>and</strong> large parts of Asia. Th ere are also <strong>littoral</strong> <strong>centipedes</strong>, presumably<br />
geophilomorphs, reported in <strong>the</strong> literature from a variety of locations when, apparently,<br />
no identifi cation was made or specimens kept e.g. Cape Verde Isl<strong>and</strong>s, Galapagos<br />
(Crossl<strong>and</strong>, 1929 ), Colombia, Panama, Costa Rica (Polhemus <strong>and</strong> Evans, 1969 ),<br />
North America (Hoff man <strong>and</strong> Carlton, 2007 ). Th ere may also be described species<br />
that have been missed in this survey.<br />
On northwestern European coasts alone <strong>the</strong>re are at least eight or so genuini or indifferenti<br />
species described (depending on taxonomic issues, etc.) <strong>and</strong> <strong>the</strong> number from<br />
Japanese shores is comparable. It would be surprising if such relative species richness<br />
was not replicated in at least some o<strong>the</strong>r regions <strong>and</strong> that areas from which only one or<br />
two or no species have been described are probably in many cases much under recorded.<br />
It seems highly likely, <strong>the</strong>refore, that <strong>the</strong>re are fur<strong>the</strong>r, as yet undescribed, <strong>littoral</strong><br />
geophilomorphs <strong>and</strong>/or a wider distribution of known species than has already been<br />
recorded.<br />
What we have is a somewhat incomplete picture but one that suggests that, wherever<br />
conditions are favourable (outside <strong>the</strong> polar regions), seashore geophilomorphs are
34 A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39<br />
likely to be found on coastlines around <strong>the</strong> world. Fur<strong>the</strong>rmore, <strong>the</strong>ir apparent tolerance<br />
of seawater would facilitate dispersal e.g. by rafting across oceans <strong>and</strong> a widespread<br />
distribution may be <strong>the</strong> eff ect of this ra<strong>the</strong>r than by accidental human transmission.<br />
What is very noticeable is that <strong>littoral</strong> species are not confi ned to one genus or family;<br />
some are in monotypic genera, o<strong>the</strong>rs in genera with many species. Table 3 lists<br />
genera with numbers of valid species listed in Chilobase ( http://chilobase.bio.unipd.it )<br />
<strong>and</strong> numbers of halophilic species. For all <strong>the</strong> reasons already mentioned, numbers are<br />
only approximate <strong>and</strong>, in addition, defi nitions/descriptions of genera <strong>and</strong> species are<br />
open to revision but this gives us a crude idea of <strong>the</strong> relative numbers of species in<br />
diff erent genera.<br />
Divergence between <strong>the</strong> centipede orders seems to date from <strong>the</strong> Silurian <strong>and</strong> early<br />
Devonian with familial divergences also almost wholly Palaeozoic (Murienne et al.,<br />
2010). As modern families, genera <strong>and</strong> species have evolved certain forms in some of<br />
<strong>the</strong>se have come to inhabit halophilic <strong>habitat</strong>s ei<strong>the</strong>r in addition to <strong>the</strong>ir more terrestrial<br />
ones or on an apparently obligate basis. As well as <strong>the</strong> monotypic genera (which<br />
would be derived from terrestrial ones) <strong>and</strong> doubtful halophiles, a dozen genera include<br />
one or more halophilic species suggesting that, within each of <strong>the</strong>se genera, certain<br />
species have become ecologically specialised as inhabitants of <strong>the</strong> <strong>littoral</strong> zone. If this is<br />
<strong>the</strong> case, <strong>and</strong> assuming that this has happened independently in each genus (possibly<br />
more than once), <strong>the</strong>n <strong>the</strong> adoption of <strong>the</strong> halophilic habit by some geophilomorphs<br />
Table 3. Genera with known halophilic species, <strong>and</strong> <strong>the</strong>ir relative number.<br />
Family Genus Number of species<br />
in genus<br />
Halophile<br />
species (s. l.)<br />
Percentage<br />
Mecistocephalidae Mecistocephalus 131 2 1.5<br />
Schendylidae Hydroschendyla 1 1 monotypic<br />
Nyctunguis 17 1 5.9<br />
Pectiniunguis 23 6 26.1<br />
Schendyla 27 2 7.4<br />
Schendylops 58 1 1.7<br />
Th indyla 1 1 monotypic<br />
Ballophilidae Caritohallex 1 1 monotypic<br />
Ballophilus 36 1 2.8<br />
Lintotaeniidae Strigamia 39 2 5.1<br />
Dignathodontidae Henia 18 1 5.6<br />
Geophilidae Erithophilus 1 1 monotypic<br />
Geophilus 136 7 5.1<br />
Lionyx 1 1 monotypic<br />
Maoriella 6 1 16.7<br />
Mixophilus 1 1 monotypic<br />
Pachymerium 22 1 4.5<br />
Polycricus 23 1 4.3<br />
Tuoba 17 11 64.7<br />
Tretecthus 1 1 monotypic<br />
Aphilodontidae Aphilodon 14 ?1 ?7.1
A.D. Barber / Terrestrial Arthropod Reviews 4 (2011) 17–39 35<br />
must have happened on a number of occasions since <strong>the</strong> order fi rst appeared.<br />
Th is certainly suggests features of <strong>the</strong> group that, in some way, “pre-adapts” <strong>the</strong>m<br />
for this <strong>habitat</strong> without, apparently, a need for a great deal of morphological (<strong>and</strong> presumably<br />
physiological) specialisation. In some genera, especially large ones such as in<br />
<strong>the</strong> genus Geophilus this colonisation of <strong>the</strong> seashore could have happened several<br />
times. In <strong>the</strong> case of miriopodi indiff erenti <strong>the</strong>re seems to be no real obstacles to <strong>the</strong>m<br />
occupying niches in both truly terrestrial as well as upper shore <strong>habitat</strong>s. For <strong>the</strong> genuin<br />
i, presumably greater specialisation or perhaps competition confi nes <strong>the</strong>m to <strong>the</strong><br />
<strong>littoral</strong> <strong>habitat</strong>. Maybe for those forms apparently halofi li genuini in some areas but<br />
terrestrial in o<strong>the</strong>rs perhaps we should look for ei<strong>the</strong>r specifi c local factors, possible<br />
population diff erences/isolation, taxonomic issues or simply lack of adequate distribution<br />
<strong>and</strong> <strong>habitat</strong> knowledge.<br />
Two genera, Pectiniunguis <strong>and</strong> Tuoba appear to have a relatively high proportion of<br />
halophilic species <strong>and</strong>, interestingly, <strong>the</strong>se are <strong>the</strong> ones identifi ed as having <strong>the</strong> distinctive<br />
pre-tarsal parunguis. Tuoba has often been considered as largely <strong>littoral</strong> genus<br />
(Lewis, 1996 ) <strong>and</strong> of <strong>the</strong> 17 species described, nearly two-thirds are <strong>littoral</strong>. Th e<br />
Australian Tuoba sydneyensis seems to have reached Hawai’i (possibly on drifting material)<br />
<strong>and</strong> maybe has been able to colonise o<strong>the</strong>rwise presumably vacant niches <strong>and</strong><br />
reversed <strong>the</strong> trend, going from essentially <strong>littoral</strong> to terrestrial. It could well be that<br />
o<strong>the</strong>r species have done <strong>the</strong> same.<br />
Acknowledgements<br />
Th e pioneering work of John Lewis both on <strong>littoral</strong> geophilomorphs <strong>and</strong> in his 1981<br />
book set <strong>the</strong> scene from which this account could be built up using a diversity of<br />
sources <strong>and</strong> from many individuals, most of whom are acknowledged in <strong>the</strong> earlier<br />
paper (Barber, 2009a ). To <strong>the</strong>se I would like to add Matty Berg, Martin Cawley, Andrey<br />
Przhiboro, R<strong>and</strong>y Mercurio <strong>and</strong> Irina Zenkova. Also <strong>the</strong> several unknown reviewers<br />
who read <strong>the</strong> fi rst draft of this paper <strong>and</strong> most helpfully pointed out various errors of<br />
emphasis, interpretation <strong>and</strong> typography.<br />
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