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Badepigrus pupoideus (H. Adams, 1866)

Description: Shell minute, pupoid in shape, spire outline strongly convex. Protoconch paucispiral, rounded, with spiral rows of minute pits, and distinct junction with teleoconch. Teleoconch up to 3 moderately rounded whorls, usually without sculpture, occasionally with oblique growth lines. Aperture ovate, with no anterior or posterior canals. Inner lip separated from last whorl by narrow groove. Outer lip smooth externally, without varix; smooth internally, a little thickened. Umbilicus closed. Colour translucent fawn to mid-brown, becoming opaque with age.

Size: Up to 2.2 mm in length.

Distribution: Endemic to Australia: Angourie, NSW, southwards and around southern Australia, and Tasmania, and northwards up the WA coast to Port Hedland, WA.

Habitat: Empty shells are common in beach washup and down to about 100 m. Living specimens are known from algae and rock washings, from the low intertidal down to about 10 m.

Comparison: This species is distinguished by the long last whorl, and the groove between the inner lip and the previous whorl.

Synonymy: Previously recognised synonyms are Amphithalamus pellyae Nevill, 1881; Rissoa pulchella Petterd, 1884; Rissoa petterdi Brazier, 1895.

Fig. 1:  Bayview, Pittwater, Sydney (C.65204)

 

Copyright Des Beechey 2010