Mactra stultorum (Linnaeus, 1758)
Mactroidea : Mactridae
To size: To 51mm. Shell Structure: Thin, brittle. Equivalve: Equivalve. Equilateral: Equilateral. Tumidity: Fairly tumid. Outline: Broadly triangular, anterior dorsal margin just lower than posterior, anterior margin more broadly curved than posterior, posterior dorsal margin almost straight, to a narrowly curved posterior margin.
Sculpture: Very fine concentric lines. Growth stages clear. Margin: Smooth. Ligament: External tiny dark brown and sunken just behind beaks, internal in 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 may be overlooked. RV two cardinals, the anterior almost parallel to the dorsal margin, and double anterior and posterior laterals. The lower laterals are longer and protrude more than the upper laterals. Pallial Musculature: Shallow pallial sinus - does not reach midline. Periostracum: Thin, light to mid-brown. Colour: Cream with purple seen externally around the beaks and internally around the edges, brown rays radiate from the beaks.
Distribution & Ecology
Continental Shelf (to 200m)
Additional Information & Related Species
Mactroidea : Mactridae
Listed are literature citing Mactra stultorum (Linnaeus, 1758). Reference containing the species Type Description is highlighted.
Linnaeus C 1758. Systema Naturae. Editio decima. 1. Regnum Animale Holmiae, Laurentii Salvii. 824pp.
- Conchological Society
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