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Anatoma tobeyoides Geiger & Jansen, 2004

Description: Shell trochiform in shape, wider than high, spire moderately raised. Protoconch three-quarters of whorl, with flocculant sculpture. Teleoconch with axial and spiral threads, axials much stronger and more numerous than spirals; on last whorl, about 15 spirals above selenizone and 25 below, and about 85 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 1.5 mm in height.

Distribution: Endemic to Australia; Swain Reefs, Queensland, to eastern SA, including Tasmania.

Habitat: Known from 27-1130 m. Moderately common.

Comparison: In the genus Anatoma, the slit is at the periphery, distinguishing it from the genera of Scissurellidae (Incisura, Scissurella, Sukashitrochus and Sinmezona). Within the genus Anatoma, A. tobeyoides differs from A. australis by having weaker spiral sculpture. There are also protoconch differences, detailed in the original description.

Figs. 1, 2, 3  HOLOTYPE W. of D'Entrecasteaux Channel, Tasmania. (C.431072) (SEM Photos D. Geiger)


Copyright Des Beechey 2005