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Adacnarca squamea Hedley, 1905

Description: Shell minute. No prodissoconch cap. Shape almost circular, umbones a little anterior of midline. Anterior and posterior end of shell smoothly rounded; ventral margin smoothly rounded. Hinge line straight with many microscopic elongate denticles, separated into two groups by triangular resilifer below umbo. Interior smooth apart from poorly defined muscle scars; margin with about 5 denticles immediately below hinge posteriorly and sometimes small denticles on ventral margin. Exterior with weak, broad concentric ribs. Periostracum very thin, fawn (Fig. 2). Shell colour white, initially translucent becoming opaque with age.

Size: Up to 2.3 mm in length.

Distribution: Known from Cape Moreton, Qld, southward to Bass Strait.

Habitat: Subtidal, 111-549 m depth. Uncommon in collections.

Fig. 1: Off Cape Moreton, Qld, 128-183 m (C.394142)

Fig. 2: Off Cape Moreton, Qld, 128-183 m (C.394142)


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