Spisula subtruncata (da Costa, 1778)
Mactroidea : Mactridae
Almost equilateral, beaks slightly to anterior.
Two forms exist: 1) Very fat, squat, umbonal-centric form: Rounded fat trigonal. Anterior dorsal margin shorter than posterior. Beaks very prominent and rounded. Anterior dorsal margin shorter than posterior to a broadly rounded anterior. Posterior margin subtruncate. 2) More elongated form: In both they have a subtruncate posterior margin. Ovate triangular. Anterior margin shorter than posterior, lower to a broadly rounded anterior margin. Posterior margin sharply rounded, almost pointed.
Sculpture: Concentric lines. Growth stages clear. Margin: Smooth. Ligament: External tiny, thin, dark brown band behind beaks. Internal set in triangular chondrophore. Hinge: LV three cardinals, which extend the height of the hinge plate, two set in an inverted v-shape, the third just behind them, small and fragile. Single anterior and posterior laterals. RV two cardinals and double anterior and posterior laterals. Upper and lower surfaces of LV laterals and inner surfaces of RV laterals are serrated. Pallial Musculature: Shallow pallial sinus not reaching the posterior end of chondrophore. Periostracum: Mid-brown. Colour: White to cream.
Distribution & Ecology
Continental Shelf (to 200m)
Additional Information & Related Species
Mactroidea : Mactridae
Listed are literature citing Spisula subtruncata (da Costa, 1778). Reference containing the species Type Description is highlighted.
da Costa E M 1778. Historia Naturalis Testaceorum Britanniae London: Millan, White, Elmsley & Robson. 254pp, 17pls.
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