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PYRAMIDELLIDAE


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Syrnola aurantiaca (Angas, 1867)

Description: Shell medium size, slender, spire straight-sided or weakly convex, up to 10 whorls. Last whorl 40% of total shell length. Protoconch (type B) coiled, of about 2 whorls, set on teleoconch with axis inclined at 110 to teleoconch. Teleoconch whorls straight-sided or weakly convex, suture well-defined, impressed; whorls smooth, without sculpture. Aperture teardrop-shaped, moderately wide; columella smooth or with a very weak plait. Shell translucent, becoming opaque white or pale orange with age.

Size: Up to 7 mm in length.

Distribution: Endemic to Australia: Port Stephens, NSW, southwards to Tas and SA.

Habitat: Empty shells are from beach washup and a few dredged down to 10 m. Moderately common.

Comparison: Compared to Syrnola tincta, this species is more orange in colour, but the major difference is that the columella is smooth or has only a very weak plait.

Synonymy: Syrnola lata Laseron, 1951 is a previously recognised synonym.

Fig. 1: Twofold Bay, NSW (C.341271).

 

Copyright Des Beechey 2016