Species Account

Poromya granulata (Nyst & Westendorp, 1839)

Poromyoidea : Poromyidae

Tebble name: Poromya granulata (Nyst & Westendorp)
Smith & Heppell name: Poromya granulata (Nyst & Westendorp, 1839)

To size: To 18 mm. Shell Structure: Brittle, rather thin. Equivalve: Subequivalve, RV a little more convex than LV. Equilateral: Subequilateral, beaks slightly in front of midline. Tumidity: Moderate. Outline: Broadly subovate; anterior broadly rounded, ventral gently curved, posterior subtruncate angled to rather long almost straight sloping posterior dorsal margin. Contour: Umbos rather prominent; posterior set off by a weak ridge running from umbo to posterior ventral junction.

Sculpture: Overall finely granular, granules arranged in radial rows. Concentric sculpture of lines and growth stops. Margin: Inner margin smooth. Ligament: Mostly internal and set on a shallow chondrophore just behind the beaks; external part small, just behind the beaks. Hinge: RV with a projecting cardinal in front of chondrophore; LV with a posterior ridge-like lateral behind chondrophore and a socket in front of chondrophore to receive RV cardinal. Pallial Musculature: Pallial sinus broad, shallow. Periostracum: Brown. Colour: Shell white.

Distribution & Ecology

Recorded primarily from northern localities off the north west coast of Scotland and the northern North Sea. Widely distributed in boreal and subarctic waters across the North Atlantic. Bathymetric ranges from about 70m to the outer shelf and continental margin, becoming progressively deeper further south.

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

Additional Information & Related Species

Related Species


Listed are literature citing Poromya granulata (Nyst & Westendorp, 1839). 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.
Nyst P H J & Westendorp G D 1839. Nouvelles recherches sur les coquilles fossiles de la province d'Anvers. Bulletins de l'Académie Royale des Sciences et Belles-lettres de Bruxelles. 6(2): 393-414.
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