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LUCINIDAE |
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Cavatidens omissa Iredale, 1930 Description: A medium-sized lucinid. Lightweight, well inflated. Shape slightly longer than high, umbo slightly forward of midline, lunule very small; anterior dorsal margin straight, other margins smoothly rounded. Exterior with irregular concentric growth ridges but no radial sculpture. Interior smooth, posterior muscle scar approximately elliptical, anterior long and narrow; pallial line continuous; margin outside pallial line weakly lined. Hinge without teeth (Fig. 2). Ligament internal, narrow. Shell colour white. Size: Up to 27 mm in length. Distribution: Endemic to Australia: Stradbroke Is, Qld, southwards to Jervis Bay, NSW. Habitat: Lives in shallow water seagrass beds and muddy sand. Comparison: This species is lightweight, well inflated with no hinge teeth. Remarks: This is very similar to the tropical Indo-West Pacific species Cavatidens bullula (Reeve, 1847) and it might just be a southern distribution of that species. Fig. 1: Simpsons Beach, Bundeena, Port Hacking, NSW (C.328517) Fig. 2: Simpsons Beach, Bundeena, Port Hacking, NSW (C.328517) |
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