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ACTEONIDAE


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Acteon fructuosus Iredale, 1936

Description: Shell relatively small, pupoid in shape, relatively wide, aperture slightly more than of total shell length. Whorls evenly convex with suture deeply impressed. Last whorl with smooth, flat spiral cords, becoming narrower towards base, with spiral cords separated by narrow grooves with axial sculpture which become stronger and override spirals towards base. Aperture broadly elongate, increasing from narrow at top to broad and rounded below; outer lip sharp, inner lip with thick white callus on previous whorl. Umbilicus widely open behind columella callus. Columella with a single fairly weak plait. Shell white, without periostracum.

Size: Up to 9 mm in length.

Distribution: Known from Port Stevens, NSW, southwards to Twofold Bay , NSW.

Habitat: Subtidal 66200 m.  Uncommon.

Comparison: This species is distinguished from Acteon subroseus by being smaller and squatter and in having an open umbilicus, and no trace of a brown periostracum.

Fig. 1: Off Port Hacking, NSW, in 82 m. (C.435444).

 


Copyright Des Beechey 2018