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Polyschides gibbosus (Verco, 1911)

Description: Shape curved, inflated at anterior quarter Weight light Aperture diameter 2.7 mm Apex 4-lobed; diameter 1.5 mm (Fig. 1b). Sculpture absent. Transverse sculpture absent. Aperture slightly compressed. Colour transparent when fresh, becoming opaque white with age.

Size: Up to 17 mm in length.

Distribution: Global distribution unknown. Assumed to be endemic to Australia with a distribution from central NSW, across southern Australia, including Tas, to Jurien Bay, central WA.

Habitat: Dredged in sand and mud from 17 to 2780 m (Lamprell & Healy, 1998). Fairly common.

Remarks: In Fig. 1a the shell apex is broken. Fig. 1b shows the 4-lobed apex of another, unbroken shell.

Fig. 1: a. East of Nowra, NSW in 9881015 m (Apex broken, C.173581). b. Detail of apex. Off Rottnest Is., WA, in 124 m (C.301470).


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