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Retusa protumida (Hedley, 1903)

Description: Shell tapering, involute. Apex umbilicate, protoconch visible at bottom of umbilicus. Shell with sides straight but outer lip expanded outwards on last whorl. Aperture narrow over top half, wide and expanded outwards at bottom. Columella smooth, parietal wall with thin callus. Whole surface smooth, or with extremely fine spiral grooves on unabraded specimens, and sometimes stronger, widely spaced spiral grooves on the base and apex. Shell translucent when fresh, becoming opaque white.

Size: Up to 7 mm in length in NSW, 11 mm in Tas.

Distribution: Endemic to Australia: Cape Byron, NSW, southwards to Tas. and SA.

Habitat: Subtidal. In NSW, known from 30-500 m. Uncommon.

Fig. 1: 5.5-7.5 miles (9.9-13.5 km) NE of Cape Three Points, in 41-50 fathoms (75-91 m). (C.16490 HOLOTYPE).


Copyright Des Beechey 2018