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Austronucula brongersmai (Bergmans, 1978)

Description: Shell minute, light in weight. Shape equivalve, inequilateral, nearly round with umbones just behind midline, umbones low, shell inflated; anterior end broadly rounded; posterior end rounded subtruncate. Hinge taxodont with strong teeth, up to 7 anterior and 4 posterior teeth. Chondrophore projecting below hinge line. Interior smooth, margin not crenulate. Exterior with weak growth lines and numerous very fine radial striae (Fig. 2). Periostracum thin, greenish. Shell colour white or colourless transparent.

Size: Up to 1.2 mm in length.

Distribution: Narrabeen, NSW, southwards to Corio Bay, Vic, including Tas.

Habitat: Known from beach sand and down to 15 m.

Synonymy: None.

Comparison: This species is distinguished by its minute size, lack of crenulations on the ventral margin and external sculpture of very fine radial striae (Fig. 2).

Fig. 1: Off Sow and Pigs Reef, Port Jackson, NSW (C.100970 PARATYPE)

Fig. 2: Figure of holotype from Bergmans (1978, Fig. 60).


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