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6499-1.jpg (188562 bytes)

 

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Pisinna vincula (Laseron, 1950)

Description: Shell minute, spire convex, sculpture variable. Protoconch of 1 whorls, sculptured with spiral rows of minute pits, with distinct junction to teleoconch. Teleoconch up to 3 rounded whorls, smooth, or less often, with spiral cord above suture or below suture or both; last whorl with periphery rounded or angled or with cord; axial sculpture absent or present as oblique growth lines, rarely strengthened to oblique axial ribs. Aperture almost circular; outer lip expanded but smooth externally. Colour fawn to orange-red .

Size: Up to 1.9 mm in length.

Distribution: Endemic to Australia: North Stradbroke Island, Queensland, southwards to Gabo Island, Victoria.

Habitat: "Found alive at extreme low water on algae and beneath stones, as well as in the sublittoral, usually in open coastal situations" (Ponder &Yoo, 1976). Uncommon in beach washup.

Comparison: Smooth specimens of this species are very similar to broad specimens of P. approxima, differing by having less rounded whorls and a more conical shape. Also see Comparison of Pisinna species.

Synonymy: Anabathron nothus Laseron, 1950 is a previously recognised synonym. It is based on unusually elongate shells with strong spiral cords (Holotype, Fig. 2).

Remarks: This species is variable, from  relatively wide shells as the holotype, shown in Fig. 1, to the narrow shell shown in Fig. 2. The strength of the spiral cords is also variable. 

Fig. 1:  Fairlight, North Harbour, Sydney, NSW (C.095043  HOLOTYPE of Scrobs vincula Laseron, 1950)

Fig. 2:  Point Halliday, NSW (C.95054  Holotype of Anabathron nothus. Laseron, 1950) (Photo Australian Museum)

 

Copyright Des Beechey 2010. Modified 2014