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NUCULANIDAE


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Nuculana ramsayi (E.A. Smith, 1885)

Description: Shape equivalve, inequilateral, very elongated posteriorly, with 2 ridges from umbones to posterior edge. Umbo well forward of midline. Anterior end rounded, posterior end drawn out into rostrum. Hinge taxodont, with up to 15 teeth on anterior side, 25 on posterior side. Interior smooth, muscle scars poorly defined, elongate ridge (that separates the siphons) inside rostrum. Exterior with raised concentric ridges, strong and widely spaced dorsally, becoming weaker and crowded ventrally. Periostracum thin, fawn. Exterior shell colour white.

Size: Up to 9.5 mm in length.

Distribution: Known from off Clarence River, NSW, southwards to Halibut Oil Field, eastern Bass Strait.

Habitat: Subtidal, 3221463 m. Moderately common.

Comparison: The strongly drawn out posterior end and strong concentric sculpture separates this species from N. dohrni.

Fig. 1: East of Sydney, in 750 m (C.370052)

 
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