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UNGULINIDAE |
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Zemysina globularis (Lamarck, 1818) Description: Shell lightweight, very inflated. Shape umbo on midline, anterior dorsal margin concave, posterior dorsal margin straight, remainder of margin smoothly rounded. Lunule absent. Exterior with microscopic irregular commarginal ridges. Interior with well-defined muscle scars, continuous pallial line; margin weakly lirate. Hinge strong; left valve with two cardinal teeth, anterior one large, protruding, bifid (often broken off); right valve with 2 cardinal teeth, posterior one bifid; lateral teeth absent. Ligament external, long. Shell colour white with thin brown periostracum. Size: Up to 28 mm in height, usually less than 15 mm in NSW. Distribution: Endemic to Australia: Off Port Stephens, NSW, southwards and around southern Australia to southwestern WA, including Tas. Habitat: In sand, down to 176 m. Occasionally found washed up on Sydney exposed coast and Harbour beaches. Comparison: This species is much more inflated than Zemysia tasmanica, and the posterior cardinal tooth is larger and protruding. Fig. 1: Off Eden, NSW, in 84 m. (C.094116) Fig. 2: Left valve of specimen in Fig. 1 |
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