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PYRAMIDELLIDAE


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7234-1.jpg (154512 bytes)

 

 

Pyrgulina ceria (Laseron, 1951)

Description: Shell medium size, elongate, with spire nearly straight-sided, up to 5 teleoconch whorls, last whorl half of total shell length. Protoconch infolded, type C. Whorls angled, sculptured with widely spaced axial folds with spiral  threads in the interspaces. Aperture length 1 times the width; columella with weak oblique plait. Shell white, covered by thick brown periostracum which peels off with age.

Size: Up to 4.5 mm in length.

Distribution: The Australian Museum holds specimens from Port Stephens, NSW, southwards to Port Hacking, Sydney.

Habitat: Specimens are from beach washup and from dredgings down to 15 m. Most are from estuaries. There are quite a few lots from sand flats at Cabbage Tree Basin, Port Hacking. Uncommon.

Remarks:  This is the only NSW pyramidellid that I have seen with a periostracum. There is the possibility that it occurs in other species and wears or peel off  after collection, but I have seen no such evidence in the Museum collection.

Fig. 1: Cabbage Tree Basin, Port Hacking, NSW (C.341526). Periostracum is peeling off.

 

Copyright Des Beechey 2017