Mactra glauca Born, 1778
Mactroidea : Mactridae
To size: To 115mm. Shell Structure: Thin, solid. Equivalve: Equivalve. Equilateral: Inequilateral, beaks to the front. Tumidity: Fairly tumid. Outline: Broadly triangular. Anterior dorsal margin lower and shorter than posterior. Posterior dorsal margin almost straight. Both anterior and posterior margins broadly rounded, although the posterior more so.
Sculpture: Fine concentric lines. Posterior dorsal area has rough, raised concentric ridges. Growth stages clear. Margin: Smooth. Ligament: External small dark brown behind the beaks. Internal on a spoon-shaped chondrophore. A tiny, thin cream coloured septum separates the internal and external. Hinge: LV three cardinals and single anterior and posterior laterals. Two of the cardinals are inverted v-shaped and the third, which is very thin and can be broken, lies directly behind the rear cardinal and can be overlooked. RV two cardinals, the anterior at around 40° to the dorsal margin, and double anterior and posterior laterals. The lower laterals are longer than the upper laterals. Pallial Musculature: Very shallow pallial sinus - reaching midway between midpoint and anterior of posterior adductor. Periostracum: Pale brown, darker to the anterior and posterior. Colour: White with pale brown radiating rays.
Distribution & Ecology
Continental Shelf (to 200m)
Additional Information & Related Species
Mactroidea : Mactridae
Listed are literature citing Mactra glauca Born, 1778. Reference containing the species Type Description is highlighted.
Born I von 1778. Index rerum naturalium Museum Caesarei Vindonbonensis pars 1, testacea Kraus, Vienna. 458pp.
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