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Clathropsis bicarinata (Laseron, 1951)

Description (based on syntypes): Shell large for the family, broadly conical, spire almost straight in outline. Protoconch of about 3 smooth whorls. Teleoconch whorls convex with deeply impressed suture; 3 spiral cords per whorl, with a secondary spiral developing between primaries from 6th 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, variable in strength, continuous between spirals, about 24 on last whorl, forming weak and variable strength nodules at intersections. Outer lip thin, crenulated by external sculpture. Anterior canal a deep U-shaped notch. Shell fawn.

Size: Up to 7 mm in length.

Distribution: Syntypes from Off Long Reef, Collaroy, NSW, in 14 fathoms (26 m). Other material available (4 lots): Broulee area; Gunnamatta Bay; 3.5-7.5 m off Chinamans Beach, Middle Harbour; Cronulla.

Habitat: Most specimens are from beach washup; the type lot is from 26 m off Long Reef.

Comparison: See C. tripilia.

Remarks: Why Laseron named this species bicarinata is not clear, as the whorls bear 3 prominent spirals.

Fig. 1: Off Long Reef, Collaroy, NSW, in 14 fathoms (C.102741 SYNTYPES)

Fig. 2: Cronulla, NSW (C.506015)


Copyright Des Beechey 2016