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Prolixodens infracolor (Laseron, 1951)

Description: Shell medium in size for the family, conical and moderately broad. Protoconch of 34 whorls, sculptured with granules and ridges. Teleoconch straight or weakly convex in outline, suture distinct. Whorls weakly convex or straight sided, with 3 strong spiral cords crossed by axial folds forming beads at intersection; about 18 axials on last whorl. Base with a further spiral, then flat or weakly convex, smooth below. Outer lip of aperture thin; inner lip thickened. Anterior canal a deep U-shaped notch. Spirals and beads pale fawn, interspaces similar or mid-brown.

Size: Lectotype 5.35 mm in length.

Distribution: New Zealand and Australia. In Australia, known only from the type lot, from off Long Reef, Collaroy, NSW, in 26 m.

Habitat: In New Zealand, intertidal down to 102 m. It is the most common cerithiopsid in the North Island of New Zealand (Marshall, 1978).

Remarks: Marshall (1978, p. 90) described the animal morphology, radula, protoconch and operculum of this species, and based on these, erected the new genus Prolixodens. Prolixodens dannevigi (Hedley, 1911), known from the subtidal of South Australia and West Australia, may be the same species.

Fig. 1: Off Long Reef, Collaroy, NSW, in 26 m (C.102748 LECTOTYPE)

Fig. 2: From Marshall (1978, Fig. 15I)


Copyright Des Beechey 2016