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Pisinna kershawi (Tenison-Woods, 1878)

Description: Shell minute, solid, spire convex in outline. Protoconch of 1 whorls, sculptured with spiral rows of minute pits, with distinct junction to teleoconch. Teleoconch up to 4 weakly to moderately rounded whorls; all whorls with close-set oblique axial ribs, sometimes absent on last third of last whorl. Aperture almost circular, sharp edged; outer lip a little expanded. Colour reddish-brown when fresh.

Size: Up to 2.7 mm in length, shallow water specimens usually less that 2.1 mm.

Distribution: Endemic to Australia: Caloundra, Queensland, southwards and around southern Australia, to eastern South Australia, including Tasmania.

Habitat: "Lives mostly in the shallow sublittoral, but sometimes found in the lower littoral in the southern parts of its range" (Ponder & Yoo, 1976). In NSW, empty shells are uncommon subtidally down to 146 m, and rarely from beach washup.

Comparison: See Comparison of Pisinna species

Synonymy: Estea microcosta May, 1920 is a previously recognised synonym.

Remarks: Axial ribs commence at the start of the teleoconch but may be very weak and difficult to see as most specimens are worn or eroded. It is very difficult to distinguish worn specimens of this species from worn specimens of P. olivacea if the latter do not have the white subsutural band well defined.

Fig. 1: Tasmania (C.45957)

 

Copyright Des Beechey 2010. Modified 2014