|Original name||Amussium meridionale Smith, 1885|
|Autoreference||Smith, 1885: 316, pl. 24, figs 1-1a.|
|Reference||Smith, E.A., 1885. Report on the Lamellibranchiata collected by H.M.S. "Challenger" during the years 1873-1876. - Challenger Reports, Zoology, 13 (35): 1-341.|
|Type data||Lectotype (pr: H 13.8 mm, L 13.4 mm, D 4.0 mm) The Natural History Museum, London (BMNH 18188.8.131.5237), designated by Dijkstra (1995: 19). Type locality: South of Western Australia, 50*01'S, 123*04'E, 3292 m, globigerina ooze, 07.03.1874 ("Challenger" stn 158).|
Shell up to ca. 15 mm high, fragile, transparent to opaque, weakly inflated, left valve slightly more convex than right valve, inequivalve, equilateral, nearly circular, auricles nearly equal with fine radial lirae, colour pellucid whitish.
Left valve with numerous fine, irregularly spaced, radial lirae and commarginal growth lines (sometimes slightly undulated as of lectotype). Right valve with closely spaced commarginal lirae. Prominent commarginal lamellae near ventral margin.
Right valve with regularly spaced commarginal lirae. Internal ribs generally 12, variable in number. Byssal notch and ctenolium lacking.
Zanzibar, Gulf of Aden, Arabian Sea, Indonesia, Coral Sea, New Caledonia, Loyalty Islands, Kermadec Islands, Wallis and Futuna Islands, Vanuatu Archipelago, SW Chile, E of Marion Island, South of Western Australia (TL)
|Habitat||Living bathyally and abyssally on soft bottom assemblages.|