Cetomya tornata (Jeffreys, 1876)
Poromyoidea : Poromyidae
Slightly inequivalve, beaks just in front of midline.
Obese, almost spherical.
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.
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
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)
Abyssal Plain (4000m +)
Additional Information & Related Species
Poromyoidea : Poromyidae
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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