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Cheirodonta labiata (A. Adams, 1851)

Description: Shell variable in size, generally small, sinistral. Protoconch large,  lecithotrophic, of 2 whorls, with 2 spiral threads, lacking axial riblets. Teleoconch whorls with 4 strongly beaded spiral cords and axial costae; spirals 1 and 3 start immediately after protoconch, spiral 2 on 3rd or 4th teleoconch whorl. Spirals 1-3 of similar size throughout. Spiral 4 weak, slightly exposed on all whorls. Another 2 spirals on base (numbered 5 and 6), smooth. Axial costae number 19-23 on penultimate whorl. Outer lip of aperture strongly flared, anterior siphonal canal short and upturned, posterior canal a U-shaped notch. Colour deep reddish brown, spiral 1 darker or lighter; edge of outer lip white in very mature specimens.

Size: Adult shells 2.7 - 4.95 mm in length.

Distribution: Endemic to Australia: Sydney, southwards to Merimbula, NSW.

Habitat: Live specimens are know from the intertidal zone, under rocks and on algae. Empty shells are moderately common in beach washup.

Comparison: The dark brown colouration, blunt protoconch and greatly flared outer lip (hence the name) assist with the identification of this species.

Figs. 1, 2:  Cronulla Beach, Sydney, NSW (C.118550) (Outer lip broken)

 

Copyright Des Beechey 2015