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Limopsis paradoxa (Iredale, 1931)

Description: Description of lectotype, a single right valve: Shape obliquely ovate, umbo small, slightly in front of midline, dorsal margin straight either side of umbo. Cardinal area narrow, with broad triangular resilifer. Anterior and posterior ends as well as ventral margin uniformly rounded. Hinge with 4 teeth either side. Interior white, smooth apart from faint radial lines, muscle scars not apparent, margin not denticulate. Exterior with irregular concentric growth ridges, radial sculpture absent. Periostracum unknown. Shell colour off-white.

Size: Lectotype 5.0 mm in length.

Distribution: Known only from two lots of dead valves. Lectotype and many paralectotypes from 16 miles (25) east of Wollongong, NSW, in 183 m. Another lot from off Cape Three Points (north of Broken Bay, NSW) in 75-91 m.

Habitat: Subtidal, 75-183 m.

Comparison: This species is similar to L. erecta in size and external sculpture but differs in the shape of the cardinal area and the resilifer.

Synonymy: Huber (2010, CD tabulation) gave this species as a synonym of Limopsis penelevis Verco, 1907, but provided no justification. At 5 mm shell length, this species is much smaller than L. penelevis, so it is preferred to maintain it as a separate species pending further investigation.

Fig. 1: 16 miles (25 km) east of Wollongong, NSW, in 183 m (C.62324 LECTOTYPE of Glycilima paradoxa)


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