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Cirsotrema martyr (Iredale, 1936)

Description: Shell tall and moderately slender, solid and heavy, teleoconch up to 9 whorls. Teleoconch whorls rounded, with very strong axial ribs. Ribs strongly rolled back to be twice as wide as high, lamellate on top, 14-16 on last whorl. Interspaces with spiral threads. Last whorl with strong spiral cord level with top of aperture; crossed by the axial ribs which continue onto base. Aperture almost circular; outer lip thickened by normal rib externally. Umbilicus closed. Colour dirty white.

Size: Up to 55 mm in length.

Distribution: Endemic to Australia; known from Stanwell Park, NSW, southwards to south of Gabo Island, Victoria.

Habitat: Subtidal, 128-223 m. Rare.

Remarks: This is a rare species. There are five specimens in the Australian Museum collection, one in the author's collection, and another reported in the literature (B.J. Smith, 1974).

Fig. 1: Off Jervis Bay, NSW, in 137 m (C.121371)

 

Copyright Des Beechey 2008