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Aclophoropsis univitta (Laseron, 1954)

Description: Shell variable in size, generally medium sized, sinistral. Protoconch lecithotrophic, 2 - 2 whorls. Teleoconch whorls with 4 beaded spiral cords and axial costae; spirals 1-3 start immediately after protoconch, of similar size throughout. Spiral 4 weak, slightly exposed on all whorls. Another 2 spirals on base (numbered 5 and 6), weak, smooth. Axial costae number 15-16 on penultimate whorl. Outer lip of aperture flared (broken in figured specimen) anterior siphonal canal short, posterior canal a shallow notch. Colour of protoconch and first teleoconch whorl white; second teleoconch whorl pale brown, third whorl dark brown, subsequent whorls white, sometimes with spiral 3 brown; base brown.

Size: Adult shells 4.0 - 6.9 mm in length.

Distribution: Endemic to Australia. Known only from Sydney Harbour, and from off Collaroy and Avalon in Sydney's northern suburbs.

Habitat: Subtidal, 26-37 m. Known only from 6 specimens.

Comparison: This species is distinguished by having spiral 2 starting immediately after the protoconch, and by the unique colouration.

Figs. 1, 2: Off Long Reef, Collaroy, NSW, in 26 m (C.065854 LECTOTYPE)

 

Copyright Des Beechey 2015