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Cassidula doliolum (Petit de la Saussaye, 1842)

Description: Shell with aperture about 60% of total shell length. Spire elevated, convex in outline, whorls weakly convex. Shell with numerous spiral grooves over whole surface. Aperture fairly broad, with 2 folds at bottom of inner lip, and smaller fold at top. Outer lip with 4 denticles internally, the middle 2 stronger, and callus extending below as thickening inside lip. Outer lip with very low, wide callus externally. Umbilicus closed by reflected columellar callus. Colour brown or grey - almost blue-grey - with faint white spiral bands at top of whorls.

Size: Up to 15 mm in length.

Distribution: In Australia, this species is known from Roebuck Bay, south of Broome, WA, across northern Australia, and southwards to Brunswick River, NSW. The distribution outside Australia is unknown.

Habitat: In mangroves, on mud.

Remarks: Denis Riek gives excellent photos of shells and living animal at http://www.roboastra.com/Mollusc5/brpr570.htm

Figs. 1, 2: Gladstone, Qld. (C.410589).


Copyright Des Beechey 8 June 2018