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Nanaphora tricolor Laseron, 1958

Description: Shell very small, sinistral. Protoconch planktotrophic, with 2 spiral threads and dense axial riblets. Teleoconch whorls with 4 strongly beaded spiral cords and axial costae; spirals 1 and 3 start immediately after protoconch, spiral 2 on about 6th teleoconch whorl. By penultimate whorl spiral 1 strong, spirals 2 and 3 weaker. Spiral 4 slightly exposed on all whorls. Another 2 spirals on base (numbered 5 and 6), weakly nodulose. Axial costae number 18-22 on penultimate whorl. Outer lip of aperture flared, anterior siphonal canal short and upturned, posterior canal a U-shaped notch. Colour : spiral 1 white, spiral 2 fawn, spiral 3 dark brown, base fawn.

Size: Adult shells 3.15 - 4.4 mm in length.

Distribution: Eastern Australia and Lord Howe Island. In mainland Australia, from Caloundra, Qld, southwards to Sydney, NSW.

Habitat: Known from empty shells from beach washup and down to 12 m. Only 4 lots in the Australian Museum collection.

Comparison: The striking colouration is distinctive.

Figs. 1, 2: Sugarloaf, Lord Howe Island (C.300746)


Copyright Des Beechey 2015