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Hedleytriphora fasciata (Tension-Woods, 1879)

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 7th teleoconch whorl. On penultimate whorl, spiral 1 strong, spiral 3 even stronger and spiral 2 weak. Spiral 4 slightly exposed on all whorls, fully exposed on last whorl. Another  spiral  on base (numbered 5), smooth. Axial costae of similar strength to spirals, strongly nodulose at intersections, 13-18 on penultimate whorl. Outer lip of aperture flared, anterior siphonal canal short and slightly upturned, posterior canal a broad triangular notch. Protoconch and teleoconch pale yellowish brown, shell opaque except for spiral 3 which is translucent with opaque white nodules.

Size: Adult shells 3.0 - 7.3 mm in length.

Distribution: Endemic to Australia: Sydney, NSW, southwards and around southern Australia to Great Australian Bight, including Tasmania.

Habitat: Known uncommonly from beach washup. Fairly common subtidally, down to 200 m.

Comparison: See H. innotabilis.

Remarks: This is a mainly a subtidal species. There are a few records from beach washup, one from intertidal algal washings, and several from algal washings down to 20 m, but most are from deeper dredgings. The figured specimen (Fig. 1) is an unusually wide specimen.

Figs. 1, 2:  Gabo Is., Vic. 28 m (C.113476)

Fig. 3:  From Hedley, 1903, pl. 33, fig. 41

 

Copyright Des Beechey 2015