Decatopecten strangei (Reeve, 1852)
REEVE, L. A. 1852-1853. Monograph of the genus Pecten. In: L. A. Reeve (Ed.), 1843-1878, Conchologia Iconica; or illustrations of the shells of molluscous animals, vol. 8. [unnumbered pages], pls. 1-35. London. [pl. 4, fig. 22]
1852 Pecten strangei Reeve, 1852
1939 Decatopecten edentiplica Iredale, 1939
1939 Decatopecten edentiplica Iredale, 1939
L. A. Reeve, 1852-1853, plate 4.
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«PECTEN STRANGEI. Pect. testà subtrigono-ovatâ, aequivalvi, plano-compressâ, aequilaterali, auriculis inaequalibus; valvis versus marginem tenuiliratis, costis quinqueradiatis, quorum tribus centralibus latiusculis plano-convexis, distantibus; valvâ sinistrâ lutescente-albâ, costis livido-fuscescentibus; valvâ dextrâ lutescente-albâ, immaculatâ, auriculis violascentlbus, lateribus purpureo-roseo strigatis.
STRANGE'S PECTEN. Shell somewhat triangularly ovate, equivalve, flatly compressed, equilateral, ears unequal; valves finely ridged towards the margin, rayed with five ribs, of which the three central are rather broad, flatly convex, and distant; left valve yellowish-white, ribs livid-brown; right valve yellowish-white, unspotted, ears violet-tinged, sides streaked with purplerose. Hab. Moreton Bay, Australia. A very characteristic species, flatly compressed, broadly and sparingly ribbed, and strikingly coloured.» LOVELL AUGUSTUS REEVE, 1852
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«Type data. Pecten strangei Reeve: three syntypes NHMUK 1950.11.14.74-76. Type locality: Moreton Bay, Australia.
[Decatopecten edentiplica Iredale: holotype (1 pr, immature) AM (not registered). Type locality: GBR, Low Isles, 9–12 fathoms [16–22 m], mud & muddy sand, leg. Dr C. M. Yonge (Iredale, 1939: 220–221)]. Comments on type data. Iredale (1939: 362) did not treat “Decatopecten edentiplica” clearly according to the ICZN Code. He did not introduce a new species name, but only a new epithet “Edentiplica” (the initial capital is presumably a typographical error). It is possible that he only wanted to distinguish the “immature” specimen from the Low Isles, the only specimen mentioned under this name, from D. plica and not to introduce a distinct new species. The immature holotype is identical to young specimens of Decatopecten strangei.
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Description. Shell up to c. 50 mm high, solid, inflated, many specimens pyxoid to more compressed, oblong, almost equally convex, almost equivalve and equilateral; left valve almost flat, right valve slightly more convex; auricles slightly unequal in shape and size, the anterior longer; umbonal angle 85–90°; left valve uniform cream, yellowish, pinkish or brownish, many specimens maculated with dots and streaks; right valve paler or whitish; interior of hinge plate dark brown, paler ventrally.
Both valves sculptured with 5–7 primary radial plicae, most specimens with 5; with a narrow, weak plica at anterior and posterior ends of disc; numerous fine, closely spaced secondary riblets on plicae and in interspaces in late growth stage. Closely spaced commarginal microsculpture on pre-radial and radial stages. Auricles with closely spaced commarginal microsculpture, on left valve with numerous radial riblets, on right valve fewer in number, weak or absent on some specimens. Dorsal margin straight. Byssal notch, fasciole and functional ctenolium lacking. Intenal rib carinae prominent near ventral margin. Resilifer narrowly triangular. Hinge teeth consisting of weak resilial teeth and 3–7 prominent intermediate and dorsal teeth. Dimensions. Illustrated specimen: QLD, Hervey Bay, Dundowran Beach (AM C.097573): rv: H 42.3, L 39.4 mm; lv: H 42.3, L 40.1 mm; D 12.4 mm.
Habitat. Juveniles byssally attached to clumps of oysters, adults free-living amongst clumps of oysters and sea grass (Zostera) on soft sediment in the littoral zone (sand or muddy sand).
Distribution. Restricted to Australia, from Dirk Hartog Island (Western Australia) northwards to the Northern Territory, eastwards to Torres Straits (northern Queensland) and southwards to Yamba, northern New South Wales. The single valve from Sydney Harbour, New South Wales (AM C.060601; Iredale, 1936: 269, pl. 20, fig. 3) was dredged from beneath the harbour floor and is possibly a fossil from a previous warm interglacial period. Decatopecten strangei does not occur in other areas of the Indo-West Pacific. The maximum living depth range is from intertidal to 73 m.
Remarks. Decatopecten strangei is closely allied to D. plica (Linnaeus, 1758), a common species from the tropical Indo-West Pacific. The two species can be more-or-less distinguished by the characters identified in Table 2. It is possible that the present species is only a southern geographical variant of Decatopecten plica, because their differences in shape, size and sculpture are weak.»
DIJKSTRA, H. H. & A. G. BEU. 2018. Living scallops of Australia and adjacent waters (Mollusca: Bivalvia: Pectinoidea: Propeamussiidae, Cyclochlamydidae and Pectinidae). Records of the Australian Museum, 70 (2): 113-330, figs. 1-102. [p. 187, 189]
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Decatopecten strangei (Reeve),; H. H. Dijkstra & A. G. Beu, 2018, Living scallops of australia and adjacent waters, figures 32G, 32I, 34G, 34H.
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