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ANABATHRIDAE |
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Pisinna vincula (Laseron, 1950) Description: Shell minute, spire convex, sculpture variable. Protoconch of 1½ whorls, sculptured with spiral rows of minute pits, with distinct junction to teleoconch. Teleoconch up to 3¼ rounded whorls, smooth or with spiral cord above suture or below suture or both; last whorl with periphery rounded or angled or with cord; axial sculpture absent, or 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 the comparison under P. olivacea. Synonymy: Anabathron nothus Laseron, 1950 is a previously recognised synonym. It is based on elongate shells with strong spiral cords (Holotype, Fig. 2). Remarks: The two specimens figured here are the extremes of this species. The specimen in Fig. 1 is unusually wide, without spiral cords and without the angle or cord at the periphery of the last whorl periphery. The specimen in Fig. 2 is unusually long and slender, with heavy cords and, as well, is unusually brightly coloured. Most specimens fall in between these two. Fig. 1: 4987-1 Off Sow and Pigs Reef, Sydney Harbour (C.353337) Fig. 2: 4986-1 Holotype of Anabathron nothus. Point Halliday, NSW (C.95054) (Photo Australian Museum) |
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