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Isotriphora simulata B.A. Marshall, 1983

Description: Shell relatively small, sinistral. Protoconch relatively large, lecithotrophic, of about 2 whorls, with 2 strongly nodulose spiral cords. Teleoconch whorls with 4 strongly beaded spiral cords and axial costae; spirals 1 and 3 start immediately after protoconch, spiral 2 after 1 or 2 whorls; spiral 4 a fine rib partly exposed on all whorls. Spirals 1-3 attain similar size by penultimate whorl. Another 2 spirals on base (numbered 5 and 6), smooth. Axial costae number 19-23 on penultimate whorl. Outer lip of aperture flared, anterior siphonal canal short and upturned, posterior canal a simple notch. Colour yellowish brown with reddish brown between nodules on spiral 3.

Size: Adult shells 3.6 - 5.6 mm in length

Distribution: Endemic to Australia: Sydney, NSW, southwards and around southern Australia to central SA, including Tasmania.

Habitat: Subtidal, down to 183 m and in beach washup. Very uncommon.

Figs. 1, 2: Little Coogee Bay, Sydney (C.113683)


Copyright Des Beechey 2015