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Anatoma australis (Hedley, 1903)

Description: Shell trochiform in shape, wider than high, spire moderately raised. Protoconch three-quarters of whorl, with flocculant sculpture. Teleoconch with reticulate pattern of spiral and axial threads, axials stronger or equal in strength to spirals, and more numerous; on last whorl, about 12 spirals above selenizone and 12 below, and 70-75 axials. Slit at margin at periphery of whorl; selenizone behind slit, with raised flanges. Umbilicus narrow, deep, without bordering keel, with smooth curve from base. Operculum corneous. Shell colour white.

Size: Up to 3 mm in height.

Distribution: Australia and Timor Sea. In Australia, Swain Reefs, Queensland, to north-western WA, including Tasmania.

Habitat: Known from 27-1463 m. Moderately common

Comparison: See Anatoma tobeyoides.

Figs. 1, 2, 3 Capricorn Channel, 16.8 miles NE of North Reef, Queensland (C.400817) (SEM Photos D. Geiger)


Copyright Des Beechey 2004