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Hedleytriphora innotabilis (Hedley, 1903)

Description: Shell relatively small, sinistral. Protoconch plankotrophic, of 4-5 whorls, smooth centrally with axial riblets in an upper and a lower band. Teleoconch whorls with 4 beaded spiral cords and axial costae; spirals 1, 3 and 4 commence immediately after protoconch, spiral 2 commences on 4th to 6th teleoconch whorl. On penultimate whorl, spirals 1 and 3 of similar size, spiral 2 weaker. Spiral 4 slightly exposed on all whorls, fully exposed on last whorl. One further smooth spiral on base (numbered 5). Axial costae of similar strength to spirals, strongly nodulose at intersections, 17-20 on penultimate whorl. Outer lip of aperture flared (broken on figured specimen), anterior siphonal canal short and slightly upturned, posterior canal a broad triangular notch. Protoconch and teleoconch reddish brown or pale yellowish brown, nodules paler.

Size: Adult shells 3.6 - 4.7 mm in length.

Distribution: Restricted to NSW: Yamba, NSW, southwards to Twofold Bay, NSW.

Habitat: Most specimens are from beach washup, with a few more dredged down to 46 m. Uncommon.

Comparison: This species is very similar to H. fasciata. Marshall (1983) reported that it differs in radula and protoconch detail, by being darker in colour, and by having "spirals 1 and 3 of similar height throughout" Of the 13 lots sorted as this species in the Australian Museum collection, less than half are identifiable on this last criterion.

Figs. 1, 2:  Long Reef, Collaroy, NSW (C.113707)


Copyright Des Beechey 2015