Tapes (Ruditapes) decussatus (Linnaeus, 1758)
Veneroidea : Veneridae
To size: To 76mm. Shell Structure: Robust, thick shelled. Equivalve: Equivalve. Equilateral: Inequilateral. Beaks in front of midline. Tumidity: Tumid. Outline: Rhomboidal to sub-ovate, dorsal margin angular. Lunule heart-shaped, not very well-defined with radiating ridges. Escutcheon extremely reduced.
Sculpture: Sculpture consisting of thin concentric grooves and radial ribs to give decussate appearance, which is stronger to the posterior and anterior parts of the shell. Margin: Margin smooth. Ligament: Ligament extending from umbo halfway to posterior. Hinge: 3 cardinals in each valve, LV centre and anterior bifid and RV centre and posterior bifid. No laterals. Pallial Musculature: Muscle scars roughly equal: Posterior slightly fatter than anterior. Pallial sinus extends to midline, rounded. Periostracum: Very thin, matt. Colour: External fawn coloured, but with red-brown spreading from umbos and/or ventral margin. Internal colouration white with orange spreading from umbo.
Distribution & Ecology
Continental Shelf (to 200m)
Additional Information & Related Species
Veneroidea : Veneridae
Listed are literature citing Tapes (Ruditapes) decussatus (Linnaeus, 1758). Reference containing the species Type Description is highlighted.
Ansell A 1961. The functional morphology of the British species of Veneracea (Eulamellibranchia). Journal of the Marine Biological Association of the United Kingdom. 41: 489-517 .
Linnaeus C 1758. Systema Naturae. Editio decima. 1. Regnum Animale Holmiae, Laurentii Salvii. 824pp.
Mikkelsen PM, Bieler R, Kappner I & Rawlings TA 2006. Phylogeny of Veneroidea (Mollusca: Bivalvia) based on morphology and molecules. Zoological Journal of the Linnean Society. 148: 439-521.
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