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Fine structure of the epidermis in Gnathostomulida

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Summary

The fine structure of the epidermis in Haplognathia simplex, Haplognathia rosea, Pterognathia meixneri (Filospermoidea) and Gnathostomula paradoxa (Bursovaginoidea) has been investigated. The epidermis in the filospermoidean species is uniform, consisting of epidermal cells with a single locomotory cilium. The structure and development, including ciliogenesis, of these epidermal cells are described. In G. paradoxa additional epidermal elements have been found: mucous cells with a presumably apocrine secretion modus are scattered in a strip-like arrangement within the epidermis. Their deverlopment is separate from epidermal cells with locomotory function. Two further types of glandular cells with either a single cilium or a diplosome are located ventrally. It is assumed that they represent an adhesive system.

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Abbreviations

ac :

accessory centriole

ap :

appendix of accessory centriole

ax :

axoneme

bb :

basal body

bf :

basal foot

bl :

basal lamina

c :

cilium

cA :

ciliary adhesive cell

ce :

centriole

cp :

ciliary pit

d :

diplosome

dy :

dictyosome

dA :

diplosomal adhesive cell

E :

epidermal cell with locomotory cilium, epidermis

ev :

epidermal vesicle (epitheliosome)

gv :

gland vesicle

m :

mitochondrion

ma :

microvillus of apical cell membrane

mp :

microvillus of ciliary pit

mv :

microvillus

n :

nucleus

ps :

prosecretory-vesicle

R :

receptor

r :

ciliary rootlet

rc :

caudal ciliary rootlet

rr :

rostral ciliary rootlert

sv :

secretory vesicle

v :

vesicle

v i :

central vesicle of multivesicular body

v o :

surrounding vesicle of multivesicular body

z :

cisternae

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Authors and Affiliations

  1. II. Zoologisches Institut und Museum der Universität, Berliner Strasse 28, D-3400, Göttingen, Federal Republic of Germany

    V. Lammert

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Lammert, V. Fine structure of the epidermis in Gnathostomulida. Zoomorphology 109, 131–144 (1989). https://doi.org/10.1007/BF00312265

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