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Isognomon ephippium (Linnaeus, 1758)

Description: Shape nearly circular, valves flattened. Dorsal margin straight, anterior margin with byssal notch in right valve. Hinge line straight with numerous ligamental blocks, number increasing with shell maturity. Interior nacreous, purple, with brown non-nacreous margin; single adductor muscle scar centrally. Exterior with irregular concentric lamellae, usually eroded. Shell colour brown to purple.

Size: Up to 130 mm in height.

Distribution: Tropical Indo Pacific and Atlantic Oceans. In Australia, northern Australia, southwards to Laurieton, NSW.

Habitat: Lives attached to solid substrates by a strong byssus, lying on the right side.

Fig. 1: Yamba, Clarence River, NSW (C.147542)


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