Cochlodesma praetenue (Pulteney, 1799)
Thracioidea : Periplomatidae
To 38 mm.
Inequivalve, right valve impedes slightly on left.
Inequilateral, beaks to posterior.
Oval, subtruncate. The anterior dorsal margin broadly curved to ventral margin. Posterior dorsal margin much lower and almost straight to the truncate posterior margin. Truncate area tends to stay covered in periostracum giving a shaded area which stands out.
Sculpture: Fine concentric grooves and thin raised ridges. Thin crack on beak gives the identifying character for it to be put in Cochlodesma . Margin: Smooth. Ligament: Internal part on an oval shaped, protruding resilifer, external is thin, tiny streak either side of the beaks. Hinge: No laterals or cardinals and no hinge plate. Resilifer protrudes downwards and is oval. Pallial Musculature: Pallial sinus fairly deep, to beneath beak and not confluent with pallial line. Periostracum: Thin, beige/cream. Colour: White.
Distribution & Ecology
Continental Shelf (to 200m)
Additional Information & Related Species
Thracioidea : Periplomatidae
Listed are literature citing Cochlodesma praetenue (Pulteney, 1799). Reference containing the species Type Description is highlighted.
Allen J A 1958. Observations on Cochlodesma praetenue (Pulteney) (Eulamellibranchia). Journal of the Marine Biological Association of the United Kingdom. 37: 97-112.
Allen J A 1960. The ligament of Cochlodesma praetenue (Pulteney). Journal of the Marine Biological Association of the United Kingdom. 39: 445-447.
Pulteney R 1799. Catalogue of the birds, shells, and some of the more rare plants of Dorsetshire London, Nichols. 92pp.
Soot-Ryen T 1941. Northern Pelecypods in the collection of Tromsø Museum I Order Anomalodesmacea Families Pholoadomyidae. Thraciidae and Periplomatidae. Tromsø Museums Arshefter Naturhistorisk Avd. Nr. 17. 61: 1-41, 10 pls.
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