Atrina: Difference between revisions
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| genus_authority = [[John Edward Gray|Gray]], 1847 |
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'''''Atrina''''' is a cosmopolitan [[genus]] of [[bivalve]] [[mollusc]]s characterized by elongated, wedge-shaped shells, distinguished from the genus ''[[Pinna (genus)|Pinna]]'' by the lack of any grooves in the [[nacre|nacreous]] lining of the shell, and by the central positioning of the [[adductor]] scar. |
'''''Atrina''''' is a cosmopolitan [[genus]] of [[bivalve]] [[mollusc]]s characterized by elongated, wedge-shaped shells, distinguished from the genus ''[[Pinna (genus)|Pinna]]'' by the lack of any grooves in the [[nacre|nacreous]] lining of the shell, and by the central positioning of the [[adductor]] scar. |
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As with other pen shells ([[Pinnidae]]) they commonly stand point-first in the sea bottom in which they live, anchored by net of [[byssus]] threads. ''Atrina'' is considered to represent the more primitive form within the Pinnidae; however, both genera are ancient and represented within the fossil record. |
As with other pen shells ([[Pinnidae]]) they commonly stand point-first in the sea bottom in which they live, anchored by net of [[byssus]] threads. ''Atrina'' is considered to represent the more primitive form within the Pinnidae; however, both genera are ancient and represented within the fossil record. |
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A typical species is ''[[Atrina fragilis|A. fragilis]]'', found in British waters. ''[[Atrina rigida|A. rigida]]'' (Lightfoot, 1786) is found on the southeast coast of North America and in the West Indies. The [[type species]] is ''A. nigra'' ([[Lewis Weston Dillwyn|Dillwyn]], 1817, originally ''P. nigra''). |
A typical species is ''[[Atrina fragilis|A. fragilis]]'', found in British waters. ''[[Atrina rigida|A. rigida]]'' ([[John Lightfoot FRS|Lightfoot]], 1786) is found on the southeast coast of North America and in the West Indies. The [[type species]] is ''A. nigra'' ([[Lewis Weston Dillwyn|Dillwyn]], 1817, originally ''P. nigra''). |
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==References== |
==References== |
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Revision as of 18:31, 22 February 2009
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| Genus: | Atrina Gray, 1847
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Atrina is a cosmopolitan genus of bivalve molluscs characterized by elongated, wedge-shaped shells, distinguished from the genus Pinna by the lack of any grooves in the nacreous lining of the shell, and by the central positioning of the adductor scar.
As with other pen shells (Pinnidae) they commonly stand point-first in the sea bottom in which they live, anchored by net of byssus threads. Atrina is considered to represent the more primitive form within the Pinnidae; however, both genera are ancient and represented within the fossil record.
A typical species is A. fragilis, found in British waters. A. rigida (Lightfoot, 1786) is found on the southeast coast of North America and in the West Indies. The type species is A. nigra (Dillwyn, 1817, originally P. nigra).
References
- Packard, Earl (Sept. 1965). "Cretaceous Pelecypods of the Genus Pinna from the West Coast of North America". Journal of Paleontology. 39 (1): 910–915.
{{cite journal}}: Check date values in:|date=(help); Unknown parameter|coauthors=ignored (|author=suggested) (help) - "Glossary". Man and Mollusc. Retrieved 2008-01-30.
- Mitchell, Patricia B. "American Stiff Pen Shell: Strength and Rigidity". Retrieved 2008-01-31.
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