lv - close up
|Original name||Amussium investigatoris Smith, 1906|
|Autoreference||Smith, 1906: 255.|
|Reference||Smith, E.A., 1906. Natural history notes from H.M. India Marine Survey Steamer "Investigator", Ser. 3 (10). On Mollusca from the Bay of Bengal and the Arabian Sea. - Annals and Magazine of Natural History (7) 18: 157-175, 245-264.|
|Type data||Lectotype (pr: H 25 mm, L 23 mm, D 4.5 mm) Zoological Survey of India, New Alipore, Calcutta (ZSI M835/1), designated by Dijkstra & Kastoro (1997: 250). Type locality: Laccadive Sea, W of Travancore, 08*37'N, 75*37'30"E, 410-519 m, alive, sand, 17.x.1898 ("Investigator" stn 248).|
Shell up to ca. 25 mm high, fragile, semi-transparent, weakly inflated, left valve slightly more convex than right valve, subcircular, inequivalve, nearly equilateral, auricles unequal in size and shape, colour of left valve creamy or orange-tinted, right valve whitish.
Left valve with many irregularly spaced radial lirae, squamous near ventral margin. Reticulate microsculpture in early growth stage. Auricles with delicate squamous radial riblets (7-10), weaker on right valve. Right valve with commarginal sculpture. Internal ribs 10 with 2 auricular riblets and some interstitial rudimentary riblets near the margin. Byssal notch and ctenolium lacking.
Laccadive Sea (TL), Indonesia, Coral Sea, New Caledonia, Loyalty Islands, Norfolk Island, Kermadec Islands, Vanuatu Archipelago
|Habitat||Living bathyally on soft bottom assemblages.|