Tapes (Polititapes) rhomboides (Pennant, 1777)
Veneroidea : Veneridae
To size: To 65mm. Shell Structure: Robust, thick shelled. Equivalve: Equivalve. Equilateral: Inequilateral. Beaks in front of midline. Tumidity: Not tumid. Outline: Rhomboidal to sub-ovate, dorsal margin long, gently sloping, almost angular. Lunule heart-shaped, clearly defined. A darker colour than rest of shell and with radiating ridges. Escutcheon poorly defined.
Sculpture: Sculpture consisting of thin concentric ridges and grooves. Margin: Margin smooth. Ligament: Ligament extending from umbo halfway to posterior. Hinge: 3 cardinals in each valve, LV centre bifid, anterior becoming bifid, but need to look closely and RV centre and posterior bifid. No laterals. Pallial Musculature: Muscle scars roughly equal: Posterior slightly fatter than anterior. Pallial sinus extends 1/3rd of way to posterior, rounded. Periostracum: Thin, smooth, satin sheen. Colour: External cream/yellow/pink-brown/pink-cream coloured, but with reddish brown/mid-brown rays/blotches/zigzags. Sometimes has no pattern. Internal colouration white sometimes with pink/orange spreading from umbo.
Distribution & Ecology
Continental Shelf (to 200m)
Additional Information & Related Species
Veneroidea : Veneridae
Listed are literature citing Tapes (Polititapes) rhomboides (Pennant, 1777). 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 .
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.
Pennant T 1777. British Zoology vol.IV. Crustacea, Mollusca, Testacea London, B. White. 154pp, 93pls.
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