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Striarca pisolina (Lamarck, 1819)

Description: Shell solid, inflated, inequilateral, equivalve. Shape elongate, umbones almost central, elevated, widely separated. Dorsal and ventral margins almost parallel, posterior end a little wider. Hinge line straight, hinge with numerous teeth, small centrally, progressively larger towards ends. Ligament external, a dark triangular patch in middle of cardinal area of each valve. Interior with radial lines, muscle scars forming large, thickened, sharp-edged pads, white. Exterior sculpture of fine radial ribs and weaker concentric ribs. Periostracum thick, with elongate laminae arising between axial ribs, covering the whole shell or only the ventral margin. Shell colour white, in life obscured by periostracum.

Size: Up to 20 mm in length.

Distribution: Indo-west Pacific. In Australia, from near Fremantle, WA, around northern Australia, to Sydney, NSW.

Habitat: Intertidal, attached by byssus to hard substrates .

Synonymy: This species has previously been recorded from Australia as Arcopsis afra (Gmelin, 1791), but that was a misidentification as that species is from West Africa, not from the Indo-west Pacific region (Huber, 2010).

Fig. 1: Woody Head, near Iluka, NSW (C.364454)



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