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Striodentalium concretum (Colman, 1958)

Description: Shape weakly curved to almost straight. Weight solid. Aperture diameter up to 2.95 mm. Apex diameter 1.3 mm. Sculpture of 79 prominent longitudinal ribs which continue undiminished to aperture; interstices smooth or with up to 3 longitudinal riblets. Transverse sculpture of irregular weak growth lines. Aperture polygonal. Colour white.

Size: Up to 57 mm in length.

Distribution: Global distribution unknown. Assumed to be endemic to Australia with a distribution from Caloundra, Qld, to southern NSW.

Habitat: Dredged from 6 to 1000 m in mud and sand. Moderately common.

Comparison: This species is similar to D. thetidis but lacks the fine riblets in the interstices between the major ribs; it is also longer, slowly tapering, and less curved.

Fig. 1: Off Nowra, NSW, in 550 m (C.172995).

 

Copyright Des Beechey 2020