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Fustiaria caesura (Colman, 1958)

Description: Shape long and slender, strongly curved, with long narrow longitudinal slit on ventral side. Weight moderate. Aperture diameter up to 3.6 mm. Apex diameter 0.7 mm. Sculpture surface smooth and polished. Transverse sculpture of weak growth lines of variable strength. Aperture circular. Colour off-white to yellow-cream, translucent when alive.

Size: Up to 39 mm in length.

Distribution: Global distribution: Australia, New Caledonia, Philippine Islands, Chesterfield Islands (Scarabino, 1995). In Australia, known from numerous locations along the NSW coast and from scattered locations off Victoria, Tasmania, South Australia and Western Australia.

Habitat: Dredged in sand from 60 to 399 m. Moderately common.

Comparison: This species can be readily identified by the smooth shell and the long slit on the dorsal side.

Remarks: The slit is of variable length, reaching up to one-quarter of the shell length, but oddly it can be completely absent in some specimens.

Fig. 1: a. East of Forster, NSW, in 247 m (C.172441). b. Same specimen, detail of slit.


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