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Colsyrnola decolorata Iredale, 1936

Description: Shell very large, tall and moderately slender, spire weakly convex, up to 15 whorls, last whorl less than 1/3 of total shell length. Protoconch (type B) coiled, of about 2 whorls, set on teleoconch with axis inclined at about 110 to teleoconch. Teleoconch whorls straight-sided or weakly rounded, suture strongly  impressed, whorls smooth, without sculpture. Aperture wide, columella with strong plait, inner lip below plait reflected outwards. Shell white with narrow tan spiral band at bottom of spire whorls and middle of last whorl.

Size: Up to 21.5 mm in length.

Distribution: Endemic to Australia: North West Island, Qld, southwards to Cape Everard, Vic.

Habitat: Subtidal, 40120 m. Uncommon.

Synonymy: Colsyrnola margarita Laseron, 1959 is a previously recognised synonym.

Fig. 1: 5.7 km E of Mistral Point, Sydney, in 7177 m (C.340908).

 

Copyright Des Beechey 2016