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Synthopsis exilis (Laseron, 1951)

Description (based solely on holotype): Shell very small for the family, broadly conical, spire weakly convex. Protoconch of 3 whorls, initially smooth, then last whorl with sparse prosocline axial folds. Teleoconch of 4 convex whorls; suture distinct. Whorls sculptured with 3 spiral cords with interspaces equal to width of cords. Axial ribs cross spiral cords forming more or less circular beads at intersections, and nearly transparent rectangular pits in between; about 16 axials on last whorl. Last whorl with spiral 4 beaded, starting at top of aperture. Base smooth, concave. Outer lip of aperture thin. Anterior canal a deep U-shaped notch. Shell colour fawn, base and columella brown.

Size: Holotype 1.9 mm in length.

Distribution: Holotype locality: Off Crookhaven, NSW, in 55-64 m. No additional material available.

Habitat: Holotype subtidal.

Comparison: This species stands out because of its small size and sculpture of oblique ribs on the protoconch.

Figs. 1, 2: Off Crookhaven, NSW, in 55-64 m (C.102761 HOLOTYPE)


Copyright Des Beechey 2016