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Pisinna albizona (Laseron, 1950)

Description: Shell minute, solid, variable in shape but generally pupoid, usually eroded, 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; whorls smooth, or with oblique axial ribs. Aperture almost circular, sharp edged; outer lip without varix. Colour cream, amber or reddish-brown, often with white band below suture.

Size: Up to 2.8 mm in length.

Distribution: Endemic to Australia: Solitary Islands (off Coffs Harbour), NSW, southwards to Cape Everard, eastern Victoria.

Habitat: Lives "on low tidal and shallow subtidal algae" (Ponder & Yoo, 1976). Common in beach washup.

Comparison: See the Comparison of Pisinna species

Synonymy: Laseron (1950) erroneously identified ribbed specimens of this species as Estea frauenfeldi Frauenfeld, 1867.

Remarks: This species is variable in shape, sculpture and colour. Shells may be relatively broad (Fig. 2a) or slender (Fig. 2c). In sculpture, shells may be smooth (Fig. 1) or have weak or strong axial ribs (Figs. 2a, c). A majority of specimens have a broad or narrow white band below the suture, but it is entirely absent in some shells and only on some whorls in others; in worn or light shells it may be difficult to see.

Fig. 1: Point Halliday, NSW (C.79209 Paralectotype)

Fig. 2:  All specimens North Harbour, Sydney, NSW (C.352122)

 

Copyright Des Beechey 2010