Species Account

Cardiomya costellata (Deshayes, 1835)

Verticordioidea : Cuspidariidae

Tebble name: Cuspidaria (Cardiomya) costellata (Deshayes)
Smith & Heppell name: Cardiomya costellata (Deshayes, 1833)

To size: To 10mm. Shell Structure: Thin, fragile. Equivalve: Slightly inequivalve, LV overlapping RV. Equilateral: Slightly inequilateral, beaks slightly behind the midline. Tumidity: Moderately inflated. Outline: Body of shell ovate; oblique, ventral extremity well in front of the line through the beaks; anterior dorsal margin sloping steeply, curved continuously with anterior and ventral margins. Rostrum short, narrowly triangular, slightly upturned, dorsal margin concave, ventral margin weakly concave corresponding to weak sulcus at junction of rostrum and body.

Sculpture: Body of shell with about 20 radial riblets increasing in size posteriorly, the last demarcating the rostrum, concentric sculpture of fine lines and growth stops; Rostrum mostly smooth except for two thin ridges running from the umbos to the end of the rostrum. Margin: Margin dentate where largest ribs intersect edges. Ligament: Internal, on a very small chondrophore lying beneath the beaks. Hinge: Cardinal teeth absent; RV with a posterior triangular lateral flange with corresponding marginal extension in LV. Pallial Musculature: Indistinct. Periostracum: Thin except on rostrum where it is feebly lamellose, light brown. Colour: Greyish white.

Distribution & Ecology

Widely distributed across the western areas and northern North Sea. Has a wide bathymetric range from mid shelf to upper slope. Carnivorous.

Depth Range
Continental Shelf (to 200m)
Continental Margin Zone (200 - 500m)
Bathyal (500 - 2000m)

Additional Information & Related Species


Listed are literature citing Cardiomya costellata (Deshayes, 1835). Reference containing the species Type Description is highlighted.

Allen J A & Morgan R E 1981. The functional morphology of Atlantic deep water species of the families Cuspidariidae and Poromyidae (Bivalvia): an analysis of the evolution of the septibranch condition. Philosophical Transactions of the Royal Society of London Series B. 294: 413-546.
Deshayes 1835. Expedition scientifique de Moree. Section des Sciences Physiques. Tome III. 1ere Partie. Zoologie. Premiere Section. Animauz vertebres, Mollusques et Polypiers.. Levrault, Paris. pp 81-203.
Olabarria C. 2005. Patterns of bathymetric zonation of bivalves in the Porcupine Sea Bight and adjacent abyssal plain, NE Atlantic. Deep-Sea Research I. 52: 15-31.


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Record last modified: 22/03/2016