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Modiolus albicosta Lamarck, 1819

Description: Shape equivalve, inequilateral, very elongate, with umbo behind anterior end. Dorsal margin nearly straight; postero-dorsal end extended, broadly rounded; ventral margin straight or slightly concave. Hinge without teeth. Ligament long, narrow. Interior smooth, slightly nacreous, white, sometimes with diffuse purple regions, muscle scars not clearly defined posteriorly. Exterior with irregular, concentric growth ridges. Colour of exterior dark brown with faint, broad, lighter band from umbo to ventral margin. Periostracum dark brown, smooth and without hairs, partially worn away in large specimens.

Size: Up to 130 mm in length.

Distribution: Sydney, NSW, southwards and around southern Australia to south-western WA, including Tasmania.

Habitat: Lives subtidally in sponges.

Comparison: This is more elongate than Moliolus areolatus and does not have any hairs on the periostracum.

Fig. 1: Twofold Bay, NSW (C.119031)

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