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CONDYLOCARDIIDAE |
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Austrocardiella trifoliata (Hedley, 1906) Description: Shell minute. Prodissoconch with radial bars centrally and 3 commarginal ribs and a thickened rim, separated by a strong ridge from adult shell. Shape higher than wide, extended anteriorly, apex on midline. Anterior and posterior dorsal margins slightly rounded, ventral margin smoothly rounded. Exterior with up to 17 commarginal ribs. Interior smooth apart from muscle scars, margin smooth. Hinge very strong, of condylocardiid style. Ligament internal. Shell translucent or opaque white. Size: Up to 1.5 mm in length. Distribution: Rockhampton, Qld, southwards and around southern Australia, to SA, including Tas. Habitat: Known from beach washup and from dredgings down to 119 m depth. There are 24 lots in the AMS collection, suggesting it is moderately common. Synonymy: Synonyms are Condylocuna cambrica Iredale, 1936 described from Sydney Harbour and Benthocardiella vitrea Laseron, 1953, from Narrabeen Beach, Sydney. Fig. 1: Exterior and interior views: Off Sow & Pigs Reef, Sydney (C.366859). Dorsal view: LECTOTYPE off Masthead Island, Qld. (C.019393). SEM images by Peter Middelfart, Australian Museum |
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