Poromya granulata (Nyst & Westendorp, 1839)
Poromyoidea : Poromyidae
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
Continental Shelf (to 200m)
Continental Margin Zone (200 - 500m)
Additional Information & Related Species
Poromyoidea : Poromyidae
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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