Laevichlamys andamanica (Preston, 1908)
PRESTON, H. B. 1908.
Descriptions of new species of land, marine and freshwater shells from the
Andaman Islands. Records of the Indian Musseum, Calcutta, 2 (2): 187-210, pl. 14-17. [p. 204, pl. 14, fig. 19]
H. B. Preston, 1908, plate 14.
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«Shell ovate, nearly equilateral, bright orange colour throughout, streaked and flecked especially on the upper part of the shell with white, both valves bearing about 60 fine, closely set, scaly riblets; auriculce small, very unequal, the anterior large, curved below, the posterior sloping obliquely, both sculptured with scaly riblets.
Long, .. .. 16.5 mm. Lat. .. .. 13.75 " Habitat — Andaman Islands.» HUGH BERTHON PRESTON, 1908
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«Description. Shell small, up to c. 30 mm high, thin, oblong, weakly inflated, right valve slighly more convex than left, almost equivalve and equilateral, auricles unequal in shape and size, umbonal angle c. 85°; colour variable, red, orange, yellow, purple or brown, with paler or darker maculations and striations or mottled, a few specimens uniformly coloured.
Both valves sculptured with numerous, closely spaced, squamous radial costae (c. 60 in adult stage), granulous microsculpture in interspaces in early growth stage, developed into divaricate scratches near anterior and posterior margins in late growth stage. Anterior auricles with prominent squamose radial riblets crossed by commarginal lamellae. Byssal notch deep, byssal fasciole broad. Functional ctenolium well-developed, with c. 6–8 teeth. Dimensions. Illustrated specimen: QLD, GBR, E of Swain Reefs, 113 m (AM C.153558), lv only: H 15.9, L 13.9 mm.
Habitat. Living in tropical shallow waters, byssally attached to rocks or coral, or amongst coral rubble on sandy substrates.
Distribution. Tropical Indo-West Pacific from Vietnam to northeastern Australia, westwards into the Indian Ocean to eastern Africa and the Red Sea, and eastwards across the Pacific to Tuvalu (Raines & Poppe, 2006: 196); Red Sea, 1.5–20 m, Gulf of Aden, 18 m (as Mimachlamys andamanica; Dijkstra & Knudsen, 1998: 82). Maximum depth range of live-taken specimens is 2–27 m. Present specimens from Australia dead at 8–10 m and 113 m.
Remarks. Laevichlamys andamanica is a new record for Australia. Only dead shells have been found from the offshore reefs of Queensland. They are similar to the type material. Juveniles could easily be confused with small specimens of Laevichlamys deliciosa (Iredale, 1939), also known from Queensland, but occurring in deeper water. Laevichlamys andamanica differs from L. deliciosa by its more subcircular and flatter shape (L. deliciosa more inflated and dorso-ventrally elongate), by its coarser radial riblets that are more widely spaced than those of L. deliciosa, and by its variable and darker coloration (L. deliciosa is bright orange, red, yellow or cream).
For synonymy see Dijkstra & Knudsen (1998: 82).» 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. 122, 124]
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Laevichlamys andamanica (Preston); H. H. Dijkstra & A. G. Beu, 2018, Living scallops of australia and adjacent waters, figures 67B, 69K, 69L.
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«Distribution and ecology.— Throughout the western and southwestern Pacific, as well as from the northern and western Indian Ocean, including the Red Sea. The species has not been reported from Indonesia before. Shell collected on a sandy bottom with coral rubble or sediments, at littoral depth.
Remarks.— The present specimen corresponds very well with the type specimens of both C. andamanica (ZSI, M4042/1, holotype) and C. perfecta (BM(NH), 1910.3.17.22, holotype). The radial costae vary in number, but are always regularly narrowly spaced. In the closely related species Chlamys irregularis (Sowerby II, 1842), the radiation is more irregular, with less costae. Another similar species is Chlamys deliciosa (Iredale, 1939), which is more elongated, with a smaller umbonal angle and some more regularly close set costae. Chlamys aliae Dijkstra, 1988, from the Philippines is similar, but larger, more convex, and with many finer, narrowly spaced costae on both valves. Juveniles of Chlamys mollita (Reeve, 1853) could be confused with C. andamanica, but the former species has a sculpture of microscopic radial costae and is somewhat more roundish in shape.» DIJKSTRA, H. H. 1991. A contribution to the knowledge of the pectinacean Mollusca (Bivalvia: Propeamussiidae, Entoliidae, Pectinidae) from the Indonesian Archipelago. Zoologische Verhandelingen, 271: 1-57, figs. 1-91. [p. 29]
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Chlamys andamanica Preston, 1908; H. H. Dijkstra, 1991, A contribution to the knowledge of the pectinacean Mollusca from the Indonesian Archipelago, figure 90.
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