Species Account

Cetomya tornata (Jeffreys, 1876)

Poromyoidea : Poromyidae

Tebble name: n/a
Smith & Heppell name: n/a

Notes on Nomenclature

Here previously as Poromya tornata.

To size: To 15mm. Shell Structure: Thin. Equivalve: Equivalve. Equilateral: Slightly inequivalve, beaks just in front of midline. Tumidity: Obese, almost spherical. Outline: Umbonate roundly subovate. Beaks strongly inturned to the anterior to create a deep lunule margin. Anterior and ventral margins a continuous broad curve. Posterior dorsal margin straight to a slightly rostrate truncate posterior margin. Ventral margin broadly rounded to a broadly rounded anterior and anterior dorsal margin. Contour: Slight rostrum is set off from body by sinus.

Sculpture: Of co-marginal lines which are intersected by radial rows of tiny tubercules. Margin: Smooth. Ligament: External, on chondrophore just behind beaks. Hinge: RV with a projecting cardinal in front of chondrophore; LV with a posterior ridge-like lateral behind chondrophore. Pallial Musculature: Pallial sinus broad, shallow. Periostracum: Beige. Colour: White.

Distribution & Ecology

Known only from the Porcupine Sea Bight at 800-4900m.

Depth Range
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)
Abyssal Plain (4000m +)

Additional Information & Related Species

Related Species


Listed are literature citing Cetomya tornata (Jeffreys, 1876). 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.
Jeffreys J G 1876. New and peculiar Mollusca of the Kellia, Cyprina and Corbula families, procured in the Valorous expedition. Annals and magazine of natural History. (4) 18: 490-499.
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: 17/05/2016