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Rhomboxiphus tricarinatus (Boissevain, 1906)

Description: Shape strongly curved, flattened laterally, elliptical in cross section, sharp keel at dorsal margin, rounded at ventral margin. Weight moderate. Aperture diameter 2.7 mm maximum dimension. Apex cut away ventrally. Sculpture longitudinal ridge along each side. Transverse sculpture dense growth lines. Aperture See Fig. 1(c). Colour white.

Size: Up to 22 mm in length.

Distribution: Global distribution: Indonesia (Timor Sea and Ceram Sea), Japan and Australia. In Australia, known from Cape York southwards to central NSW.

Habitat: Dredged from 750 to 1788 m (Lamprell & Healy, 1998). Uncommon.

Comparison: This species is very similar to Bathoxiphus colmani, but differs by having a sharp keel on the dorsal margin and the ventral margin being rounded. There is a longitudinal ridge along each side which is not present in B. colmani. This is best seen by comparing Fig. 1c of the two species.

Fig.1: Coral Sea, in 1108-1161 m (C.165354) a. Lateral view, b. Apex, c. Aperture.


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