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Badepigrus semicinctus (May, 1916)

Description: Shell minute, tall and elongate, spire outline nearly straight. Protoconch of 1 whorl, sculpture unknown, with distinct junction with teleoconch. Teleoconch up to 3 slightly rounded whorls; early whorls smooth, last whorl with strong spiral keel on periphery. Aperture almost circular, with no anterior or posterior canals; outer lip greatly thickened by smooth varix externally. Umbilicus closed. Colour white.

Size: Up to 2.1 mm in length.

Distribution: Endemic to Australia: known from Forster, NSW, southwards to Tasmania.

Habitat: The Australian Museum holds only four lots from NSW; three from the continental shelf at depths of 60-113 m, and one from beach washup. The type is from Thouin Bay, eastern Tasmania, in 73 m.

Comparison: This species stands out because of the unusual peripheral keel restricted to the last whorl.

Synonymy: None.

Fig. 1:  Off Crowdy Head, NSW, in 91 m (C.214118) (Debris in aperture)

Fig. 2:  Original type figure from May (1916)

 

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