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7693-1.jpg (301709 bytes)



Nypamodiolus longissimus (Thiele, 1931)

Description: Shape equivalve, inequilateral, very elongate, umbo a quarter of shell length from anterior end. Dorsal margin straight behind umbo, ventral margin concave. Hinge without teeth. Ligament long. Interior nacreous, muscle scars prominent. Exterior with irregular concentric growth ridges. Periostracum moderately thick, glossy, yellow-brown.

Size: Figured specimen 23 mm in length.

Distribution: Known from deep water in the Philippines, Japan and Australia. The Australian Museum holds five lots, totalling about 60 specimens: 10-11 miles north-east of Raine Island, Qld, in 1000 m (C.449214); east of Broken Bay, NSW, in 914 m (C.169035); off Wattamolla, NSW, in 457 m (Unreg.); north-east of Port Jackson, NSW, in 452 m (Unreg.); east of Sydney, NSW, in 457 m (Unreg.)

Habitat: Known living on sunken wood, whale bones, coconuts or nipa palm fruit in 500-1500 m depth.

Remarks: Horikoshi & Tsuchida (1984) have described the mode of life and change in shape of the shell with growth.

Fig. 1: 10-11 miles NE of Raine Island, Qld, in 1000 m (C.449214)

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