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Clathropsis tripilia (Laseron, 1951)

Description (based on syntypes): Shell large for the family, broadly conical, spire almost straight in outline. Protoconch of 3 whorls sculptured with about 5 spiral threads (Fig. 2. Protoconch of syntype, shell worn). Teleoconch whorls convex with deeply impressed suture; 3 spiral cords per whorl, with a secondary spirals developing between primaries from about 7th whorl, these increasing in strength with growth. Last whorl with an additional smooth spiral level with top of aperture, base concave below. Spirals crossed by curved axial ribs, continuous between spirals, about 35 on last whorl, forming nodules at intersections. Outer lip thin, crenulated by external sculpture. Anterior canal a deep U-shaped notch. Shell yellowish brown.

Size: Up to 8.5 mm in length.

Distribution: Syntypes from North Harbour, Port Jackson, NSW . Additional material available (3 lots); Collaroy Beach; Kurnell, Botany Bay; Cronulla Beach.

Habitat: All specimens are from beach washup.

Comparison: This species differs from C. alternata by being a larger shell and having 3 rather than 4 fully exposed spirals on the teleoconch whorls. It is very similar to C. bicarinata, differing by having the protoconch spirally threaded rather than smooth, and the colour yellow brown instead of fawn.

Figs. 1, 2: North Harbour, Port Jackson, NSW (C.102756 SYNTYPE)


Copyright Des Beechey 2016