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Costatophora iniqua (Jousseaume, 1898)

Description: Shell relatively small,  sinistral. Protoconch plankotrophic, of 4-5 whorls, with one fine spiral thread and numerous axial riblets. Teleoconch whorls with 4 beaded spiral cords and axial costae; spirals 1 and 3 commence immediately after protoconch, spiral 2 commences on 3rd to 5th whorl; spirals 1-3 of similar size by penultimate whorl. Spiral 4 partly exposed at suture on all whorls. Another 2 spirals on base (numbered 5 and 6), weak, smooth. Axial costae of similar strength to spirals, strongly nodulose at intersections, 17-24 on penultimate whorl. Outer lip of aperture slightly flared, anterior siphonal canal short and slightly upturned, posterior canal a broad notch. Protoconch colour buff white. Teleoconch colour similar to protoconch, with a brown line around spirals 1, 4 and 5.

Size: Mature shells 2.6 - 7.8 mm in length.

Distribution: Indo-West Pacific. In Australia, known from a few lots from Queensland and only two from NSW: Angourie, NSW and Long Reef, Collaroy, NSW.

Habitat: Known from beach washup and intertidal rock washings.

Comparison: This species is easily recognised by the brown lines in some spirals.

Synonymy: Mesophora sardonyx Laseron, 1958 is a synonym.

Figs. 1, 2: 6833-1 6834-1 Yamba, NSW (C.118577)


Copyright Des Beechey 2015