Species Account

Ctena decussata (O G Costa, 1829)

Lucinoidea : Lucinidae

Tebble name: n/a
Smith & Heppell name: Codakia decussata (O G Costa, 1836)

To size: To 20mm. Shell Structure: Solid. Equivalve: Equivalve. Equilateral: Inequilateral, beaks to posterior. Tumidity: Tumid. Outline: Circular to ovate, posterior dorsal margin short, posterior and anterior margins broadly rounded, anterior-dorsal margin slightly concave. Contour: Short, shallow lunule, slightly longer, just as shallow escutcheon.

Sculpture: Concentric lines, radial lines. Growth stages clear. Margin: Crenulate. Ligament: Small, pale ligament reaching halfway to posterior. Hinge: Two cardinals in each valve and single anterior and posterior laterals in both valves. Pallial Musculature: No pallial sinus. Pallial line continuous. Anterior adductor longer and narrower than posterior. Periostracum: Thin, beige. Colour: White.

Distribution & Ecology

A southern, primarily Mediterranean species, extending to northern Spain. Has been recorded from the Scilly Is and Cornwall (pre-1950). Often associated with seagrass beds in the sublittoral and shallow shelf.

Depth Range
Continental Shelf (to 200m)

Additional Information & Related Species

Additional Comments

A Mediterranean species known only from two records of valves only from Scilly and Cornwall.

Related Species


Listed are literature citing Ctena decussata (O G Costa, 1829). Reference containing the species Type Description is highlighted.

Costa O G 1829. Osservazione Zoologiche intorno ai testacei dell’Isola di Pantelleria Napoli, Tiografia della Minerva. 12pp.
McMillian NF 1971. Three lamellibranchs apparently new to Britain. Journal of Conchology. 27: 266.


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Record last modified: 17/05/2016