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TRIGONIIDAE |
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Neotrigonia strangei (A. Adams, 1854) Description: Shell solid and heavy. Shape triangular-ovate, anterior and ventral margins uniformly rounded, posterior margin truncate, postero-dorsal margin straight or slightly concave. Exterior divided by radial sculpture into 2 zones. Anterior zone with about 16 strong radial ribs with large nodules that are oval-shaped and wider distally. Posterior zone of about 6 weaker radials with smaller but sharper nodules. Concentric riblets between radial ribs. Interior nacreous silver, muscle scars well defined; grooved ventrally, with interlocking scalloped margin. Hinge very strong, with 2, narrow, elongate, deep sockets in left valve and two matching blade-like teeth in right valve. Shell colour fawn externally, white internally. Size: Up to 37 mm in height. Distribution: Cape Moreton, Qld, southwards to Montague Island, NSW. Habitat: Lives in sandy patches in reef areas subtidally (Coleman, 1981, p. 243). Rarely found as beach washup. Known as fossil from Sydney Harbour. Comparison: This species is characterised by the strong, distally expanded nodules, previously described as mushroom-shaped. Fig. 1: Seven Mile Beach, south of Gerringong, NSW (C.363390) |
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