Pascahinnites coruscans coruscans (Hinds, 1845)
HINDS, R. B. 1844-1845. The zoology of the Voyage of H.M.S. Sulphur, under the command of Capt. Sir E. Belcher, during 1836-1843. Vol. II. Mollusca. Smith Elder and Co. London, 72 pp., pls. 1-21. [p. 61, pl. 17, fig. 3]
1845 Pecten coruscans Hinds, 1845
1853 Pecten cuneolus Reeve, 1853
1888 Pecten schmeltzii Dunker in Küster & Kobelt, 1888
1888 Pecten sulphureus Dunker in Küster & Kobelt, 1888
1915 Chlamys cellularis Oliver, 1915
1932 Pecten eucosmia Turton, 1932
1853 Pecten cuneolus Reeve, 1853
1888 Pecten schmeltzii Dunker in Küster & Kobelt, 1888
1888 Pecten sulphureus Dunker in Küster & Kobelt, 1888
1915 Chlamys cellularis Oliver, 1915
1932 Pecten eucosmia Turton, 1932
R. B. Hinds, 1844-1845, plate 17.
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«251. PECTEN coruscans, (Plate XVII, fig. 3.) Testa suborbiculari, planiuscula, tenui, inaequiauriculata, pallide violascente, prope umbones strigis parvis lacteis obliquis induta; valvis convexiusculis, consimilibus, dextra pallidiore, costis quatuordecem serratis, argute sulcatis, interstitiis sulcatis; auriculis inaequalibus, serrato-sulcatis, postica minima, obliqua; intus pallescente.
Inhab. Port Anna Maria, Nukuhiva, Marquesas Islands. In seven fathoms, on a sandy floor.
Some small milk-white strigae traverse the valves near the umbos in an oblique direction, and are very characteristic. The ribs are very minutely and sharply sculptured, and they retain the same structure on both valves. Each rib is divided by the sulci into about five smaller, the odd one being situated on the summit and giving it a sharp-keeled edge.» RICHARD BRINSLEY HINDS, 1845
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«Type data. — Lectotype (H 16.4 mm, pv) BMNH 19709, designated by Waller (1972: 231). Type locality: Marquesas Islands, Nukuhiva, 13 m.
Material examined. — Philippines: PMBP 2004, Stn B8, 3 m, 1 pv (A), 2 v; Stn B11, 2-4 m, 1 v; Stn B38, 17-18 m, 1 v; Stn S14, 5-12 m, 1 v.
Description. — Shell up to 22 mm high, most specimens 10-15 mm in height, subcircular to more elongate, almost equivalve, equilateral (juvenile) to more prosocline (mature), right valve somewhat more convex than left, auricles unequal, umbonal angle c. 90˚; colour highly variable, most specimens whitish, cream or tawny, with opaque white, red or brown maculations; a few specimens uniform bright yellow, purplish or orange. Both valves sculptured with 14-15 primary radial plicae, commencing in early growth stage (c. 0.5 mm), with 50-70 (most specimens with c. 60) squamose secondary radial riblets on and between plicae, giving plicae a tripartite or fasciculate appearance towards ventral margin. Antimarginal microsculpture in preradial stage, replaced by intercostal shagreen microsculpture in radial stage on disc and auricles. Anterior auricles much larger than posterior, with 5-8 prominent, unevenly developed radial riblets; riblets narrower and weaker on posterior auricles. Postero-dorsal margin of hinge line somewhat declined. Byssal fasciole broad, byssal notch shallow. Functional ctenolium with 4-6 teeth. Resilium triangularly elongate. Hinge with weak resilial teeth and more prominent dorsal teeth. Interior plicate.
Distribution. — Tropical Pacific, from southern Japan southwards to Australia, westwards into the Indian Ocean to eastern South Africa (not into the Red Sea), and eastwards into the Pacific to French Polynesia. Eastern South Africa, Zanzibar, Mauritius, Maldive Islands, Cocos-Keeling Islands, southern Japan, southern China, Philippines, eastern Australia, New Caledonia, Loyalty Islands, New Hebrides, Lord Howe Island, Norfolk Island, Kermadec Islands, Mariana Islands, Caroline Islands, Marshall Islands, Gilbert Islands, Fiji Islands, Wallis and Futuna, Samoa, Tonga, Cook Islands, Line Islands, Society Islands, Tuamotu Archipelago, Marquesas Islands, Austral Islands and Pitcairn Island (Waller 1972: 234; Dijkstra & Marshall 1997: 101; Dijkstra & Marshall, 2008: 51; Raines & Poppe, 2006: 236). Present specimen from the Philippines alive at 3 m. Bathymetric range of live-taken specimens is intertidal to 50 m (ZMA, unpubl. data). Living byssally attached to coral or amongst coral rubble or gravel on sandy bottoms. The subspecies Pascahinnites coruscans hawaiensis (Dall, Bartsch & Rehder, 1938) is living around the Hawaiian Islands. Remarks. — The present specimens from the Philippines are indistinguishable from the type material from the Marquesas Islands. Pascahinnites coruscans s.l. was formerly placed in Chlamys and Semipallium, but actually assigned to Pascahinnites, based on the lack of an external prismatic layer in the early right dissoconch stage (Paulay 2003).» DIJKSTRA, H. H. 2013. Pectinoidea (Bivalvia: Propeamussiidae and Pectinidae) from the Panglao region, Philippine Islands. Vita Malacologica, 10: 1-108, pls. 1-32. [p. 72, 73]
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Pascahinnites coruscans coruscans (Hinds, 1845); H. H. Dijkstra, 2013, Pectinoidea from the Panglao region, Philippine Islands, plate 19, figures 3a-3d.
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«For comments on the present species see Dijkstra and Marshall (1997: 101), and Dijkstra and Kilburn (2001: 296). Pascahinnites coruscans is distinctive among Recent
Pectinoidea in having a primary tripartite radial sculpture, flanked with one or two intercostal radial riblets, and a reticulate microsculpture. Unlike P. pasca (Dall, 1908), from Easter Island, P. coruscans lives attached to the substratum by byssus rather than cementation with the right valve. Pascahinnites coruscans was formerly placed in Chlamys, Semipallium and Bractechlamys, but recently assigned to Pascahinnites, based on the lack of an external prismatic layer in the early right dissoconch stage (Paulay 2003). DIJKSTRA, H. H. & B. A. MARSHALL. 2008. The recent Pectinoidea of the New Zealand region (Mollusca: Bivalvia: Propeamusiidae, Pectinidae and Spondylidae). Molluscan Research, 28 (1): 1-88, figs. 1-70. [p. 51]
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Pascahinnites coruscans coruscans (Hinds, 1845); H. H. Dijkstra & B. A. Marshal, 2008, The recent Pectinoidea of the New Zealand region, figures 48A, 48D.
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«Distribution: Throughout tropical Indo-West Pacific, as far south as southern Natal, although not yet recorded from the Red Sea and Persian Gulf. Turton’s specimen from Port Alfred (described as Pecten eucosmia) was taken from a drift log, and does not demonstrate its occurrence south of KwaZulu-Natal.
Habitat: Living byssally attached to rocks or corals, often nestling in crevices, commonly in shallow waters (intertidally to about 20 m). Remarks: Reeve (1853) described P. cuneolus from an unknown locality; the locality ‘Durban’, subsequently scribbled on the type label by E. A. Smith, refers to a specimen sent to the latter by Burnup, and does not reflect the likely origin of Reeve’s material. P. cuneolus, P. schmeltzii and P. sulphureus are in all respects similar to P. coruscans. HD has examined possible syntypes (5 specimens) of P. schmeltzii from Fiji and Upolu (Samoa) in MNHB; the figured specimen is not present in LMA. The figured holotype (a yellow specimen) of P. sulphureus (MNHB) is labelled ‘Pecten sulphureus Dkr Viti Ins.’. C. cellularis from the Kermadec Islands, although somewhat more solid and oblique than typical S. coruscans (Dijkstra & Marshall, 1997), appears to be another synonym. The holotype of P. eucosmia from Port Alfred also agrees well with the types of Pecten coruscans (for P. eucosmia sensu Boshoff 1965, see Volachamys fultoni). The morphological characters of Pecten coruscans conform most closely to those of genus Semipallium.» DIJKSTRA, H. H. & R. N. KILBURN. 2001. The family Pectinidae in South Africa and Mozambique (Mollusca: Bivalvia: Pectinoidea). African Invertebrates, 42: 263-321, figs. 1-55. [p. 296]
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Semipallium coruscans coruscans (Hinds, 1845); H. H. Dijkstra & R. N. Kilburn, 2001, The family Pectinidae in South Africa and Mozambique, figures 31, 32.
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«HINDS (1845, p. 61) in his "ZooIogy of the Voyage of the H. M. S. Sulphur" did not designate a holotype of Pecten caruscans, nor was his type series preserved intact. According to E. A. SMITH (1906, p. 705), a large collection of shells was presented to the British Museum by Hinds in 1842, these shells having been collected by Hinds during the voyage of the Sulphur. Two years later, Captain Sir Edward Belcher, who commanded the Sulphur, presented 79 cotypes of species described by Hinds in "The Zoology of the Voyage of the H. M. S. Sulphur," and in 1851, at the sale of Capt. Belcher's collection, 2324 additional specimens were purchased by the British Museum. One may reasonably infer, then, that most of the type-materials of Hinds came to be deposited in the British Museum.
The shell figured by REEVE ( 1853, plt. 33, fig. 149 ), in the Cuming collection of the British Museum, bears a label statinq that it is from the Marquesas and is "very like Hinds' figure." Indeed the specimen exactly coincides with the outline of the figure in Hinds, and the detail of its color pattern is precisely the same. In view of the probability that this is the specimen illustrated by Hinds, or that it is at least a specimen in Hinds' type series, it is herein selected as the lectotype and is refigured Figures 1-7,12). The type-locality of Chlamys caruscans coruscans may be considered to be the locality given by HINDS (1845, p. 61) : "Port Anna Maria, Nukuhiva, Marquesas Islands. In seven fathoms, on a sandy floor." The types of Pecten cuneolus Reeve, 1853, are like Chlamys coruscans coruscans in all respects. Reeve's species is therefore treated as a junior subjective synonym. Pecten sulphureus Dunker is synonymized because both the original figures in KÜSTER & KOBELT (1888, plt. 72, figs. 5, 6) and the type locality (Fiji Islands) indicate that it is probably C. coruscans.» WALLER,
T. R. 1972. The Pectinidae (Mollusca: Bivalvia) of Eniwetock Atoll,
Marshall Islands. The Veliger, 14 (3): 221-264, pls. 1-8. [p. 233]
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Chlamys coruscans coruscans (Hinds, 1845); T. R. Waller, 1972, The Pectinidae of Eniwetock Atoll, plate 1, figures 1-19.
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