Veprichlamys perillustris (Iredale, 1925)
IREDALE, T. 1925. Mollusca from the continental shelf of eastern Australia. Records of the Australian Museum, 14 (4): 243-270. [p. 254, pl. 41, figs. 3-4]
1925 Chlamys perillustris Iredale, 1925
T. Iredale, 1925, plate 41.
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«While on the difficult group of Chlamys, the present beautiful and distinct deep-sea species may be named.
Shell of medium size, flattened, ears very unequal, thin, obliquely oval. Right valve apically smooth, then ornamented with about twenty slender radial ribs, the interstices between very broad; the ribs are a little wavy at first, later obliquely radiating with a gentle curve; lamellae arise and these are placed rather distant, and, growing angulate and tallish, resemble thorns; the interstices between the ribs are minutely scratched longitudinally; the sculpture on the left valve is similar, but the prickles begin at an earlier stage, and are more closely packed posteriorly. Colour pale orange to orange brown; internally white. Hinge line straight, ligamental pit triangular, small, with scarcely perceptible ridge and corresponding groove very minutely serrated. Ears: the posterior auricle of the right valve is small, obliquely ranged with three or four prickly lines; the anterior auricle has four ribs crossed by strong lines almost like lamellae, and the ctenolium is broad, shallow and lined; the posterior auricle of the left valve is small and scarcely ribbed, only oblique growth lines occurring; the anterior auricle has half a dozen linear ribs furnished with fine prickles. Length (height) of type 29 mm., breadth 25 mm. From 150-250 fathoms off Gabo Island. Also from 128 fathoms 20 miles east of Maria Island. This species has little to do with any other Australian scallop, save Pecten challengeri E. A. Smith, dredged by the "Challenger" in 410 fathoms off Sydney (station 164b) .» TOM IREDALE, 1925
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«Description. Shell up to c. 37 mm high, thin, weakly inflated, strongly prosocline, almost equivalve, strongly inequilateral, anterior auricles markedly larger and longer than posterior ones, umbonal angle c. 85–90°; whitish or pale orange to orange-brown, a few specimens yellowish.
Both valves sculptured with c. 20 regular, narrow, widely spaced scaly costae and intercostal antimarginal microsculpture, forming evenly concave intercosal spaces. Pre-radial stage with short antimarginal ridgelets (Beu & Darragh, 2001: fig. 39G, I), continuing intercostally over disc; antimarginal ridgelets long and straight near centre of disc. Anterior auricles with 3–4 narrow, weakly scaly radial riblets; posterior auricle of left valve smooth, of right valve with 4–5 prominent squamous radial riblets. Byssal notch relatively deep, byssal fasciole broad. Functional ctenolium well-developed, with 5–6 teeth. Dimensions. Illustrated specimen: VIC, S of Gabo I., 365 m (AM C.154683): rv: H 37.0, L 33.0 mm; lv: H 37.3, L 32.6 mm; D 11.0 mm. Iredale (1925: 254) stated the dimensions of the holotype as H 29, L 25 mm.
Habitat. Living on the continental shelf and in the upper bathyal zone, probably byssally attached to hard substrates on soft bottoms.
Distribution. Australian temperate waters, from New South Wales (c. 33°S) southwards to the Great Australian Bight. Present specimens alive at 274–467 m.
Remarks. This species closely resembles its New Zealand congener Veprichlamys kiwaensis (Powell, 1933) (Dijkstra & Marshall, 2008: 61, figs 51–52), differing mainly in shape (V. perillustris is much more strongly prosocline than V. kiwaensis) and sculpture (V. perillustris has about 20 costae, V. kiwaensis about 25, with secondary interstitial riblets near the ventral margin in some specimens that are absent from V. perillustris). Veprichlamys kiwaensis also consistently has pink radial costae on a paler ground, whereas the costae are not distinctively coloured in V. perillustris.»
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. 271, 273]
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Veprichlamys perillustris (Iredale); H. H. Dijkstra & A. G. Beu, 2018, Living scallops of australia and adjacent waters, figures 84F, 84H, 86A, 86C.
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«Remarks. In most characters, Veprichlamys leprosa sp. nov. is a typical species of Veprichlamys, the only one we know of occurring fossil in either Australia or New Zealand. It differs from V. perillustris in many obvious characters, particularly the much smaller size (V. perillustris reaches at least 38 mm in height), the much shorter and wider, less markedly prosocline disc, and the more numerous, more crowded, more frequently subdivided and intercalated radial costae, bearing more numerous spiny scales than in V. perillustris. The LV preradial dissoconch sculpture also is markedly more prominent than in V. perillustris; although very similar in the spacing of the commarginal ridges and antimarginal ridgelets, the preradial sculpture of V. perillustris is much more subdued, and gives the appearance of having been smoothly abraded off. A similar evolutionary series from a more coarsely sculptured LV preradial dissoconch in Miocene species to weaker sculpture in younger species is seen also in Semipallium, Talochlamys and Mimachlamys, indicating that a reduction in the prominence of the earliest sculpture on the LV is a common evolutionary trend in the Pectinidae. Although the antimarginal ridgelets on the central few radial interspaces of the disc of V. leprosa are unusually straight and continuous, none is quite as prominent and strictly continuous as in V. perillustris (Fig. 39H).»
BEU, A. G. & T. A. DARRAGH. 2001. Revision of southern Australian Cenozoic fossil Pectinidae (Mollusca: Bivalvia). Proceedings of the Royal Society of Victoria, 113: 1-205, figs. 1-67. [p. 117]
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Veprichlamys perillustris (Iredale); A. G. Beu & T. A. Darragh, 2001, Revision of southern Australian Cenozoic fossil Pectinidae, figures 39A, 39C, 39G -39I.
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