Cardiomya knudseni Allen & Morgan, 1981
Verticordioidea : Cuspidariidae
To 9 mm.
Slightly inequivalve, LV overlapping RV.
Slightly inequilateral, beaks slightly in front of the midline.
Body of shell ovate; ventral extremity at line through the beaks; anterior dorsal margin distinct; dorsal part of anterior margin obliquely truncate, remainder of anterior and ventral margins a broad curve. Rostrum about half of body length, dorsal margin straight; ventral margin concave corresponding to weak sulcus at junction of rostrum and body.
Sculpture: Body of shell with about 20 primary radial riblets, the largest mid-ventral; secondary riblets appearing later between median and posterior ribs to give a total count of up to 30. Anterior area with 1-2 feeble striations. Concentric sculpture of fine lines and growth stops. Rostrum with 3-4 fine radial lines. 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 lateral flange; LV without teeth. Pallial Musculature: Obscure. Periostracum: Obscure. Colour: White, internal nacreous.
Distribution & Ecology
Recorded from Porcupine Sea Bight by Olabarria (2005). We have seen numbers of specimens from the entire Atlantic Margin and note considerable variation such that we are not convinced that any of this material can be attributed to C. knudseni: much of it falls within C. costellata, curta and striata.
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)
Additional Information & Related Species
Verticordioidea : Cuspidariidae
Listed are literature citing Cardiomya knudseni Allen & Morgan, 1981. 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.
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.
- Conchological Society
of Great Britain & Ireland
Provides resources for understanding, identifying, recording, and conserving molluscs
Check List of European Marine Mollusca
The Marine Life Information Network for Britain and Ireland (MarLIN) provides information for marine environmental management, protection and education. It is a centre of excellence in spatially based and time-series marine biological information and supports good stewardship in the marine environment.
- NBN Gateway
National Biodiversity Network's Gateway. Use it to explore UK biodiversity data, as contributed by participating data providers.
- Malacological Society
- Unitas Malacologica
- Census of Marine Life
MarBEF, a network of excellence funded by the European Union and consisting of 94 European marine institutes, is a platform to integrate and disseminate knowledge and expertise on marine biodiversity, with links to researchers, industry, stakeholders and the general public.