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7392-1.jpg (412262 bytes)



Williamia radiata (Pease, 1861)

Description: Shell small to moderate in size, thin, moderate in height. Apex coiled, pointed backwards. a quarter to an eight of shell length from posterior margin, aligned with the mid-line of the shell. Anterior slopes of dorsum convex, posterior slope concave. External surface smooth, apart from irregular growth lines. Interior glossy, siphonal groove indistinct. Shell translucent becoming opaque with age, fawn or pale brown, sometimes with brown bands radiating from apex to margin.

Size: Up to 8 mm in length.

Distribution: Widespread in the Pacific Ocean, from Japan to Hawaii and Easter Island. In Australia, known from the North-West region and on the east coast, from northern Qld southwards to Twofold Bay, NSW.

Habitat: The exact habitat in NSW is unknown. Most specimens available are from beach washup. Moderately common.

Synonymy: Capulus nutatus Hedley, 1908 and Roya kermadecensis Iredale, 1912 are previously recognised synonyms.

Remarks: Marshall (1981) reported on the taxonomy, radula and shell morphology of this species in the western Pacific.

Fig. 1: 7392-1 Point Halliday. near Forster, NSW (C.336021)



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