Pinna (genus)

Pinna (genus)

Taxobox
name = "Pinna"


image_caption = "Pinna nobilis" shell and byssus
regnum = Animalia
phylum = Mollusca
classis = Bivalvia
ordo = Pterioida
familia = Pinnidae
genus = "Pinna"
genus_authority = Linnaeus, 1758

"Pinna" is a genus of pen shells. It is a cosmopolitan genus of bivalve molluscs characterized by elongated, wedge-shaped shells which most commonly stand point-first in the sea bottom in which they live, anchored by a net of byssus threads.

"Pinna" is distinguished from its sibling genus "Atrina" by the presence of a sulcus dividing the nacreous region of the valves, and the positioning of the adductor scar on the dorsal side of shells.

The type species of the genus is "Pinna rudis".

The most completely studied species in the genus is "P. nobilis", a Mediterranean pen shell which was historically important as the principal source of sea silk.

The genus "Pinna" is ancient, and is represented in Cretaceous fossils.

References

*cite journal
last = Packard
first = Earl
coauthors = Jones, David L.
title = Cretaceous Pelecypods of the Genus Pinna from the West Coast of North America
journal = Journal of Paleontology
volume = 39
issue = 1
pages = 910–915
date = Sept. 1965
*cite web
url = http://www.manandmollusc.net/glossary.html
title = Glossary
publisher = Man and Mollusc
accessdate = 2008-01-30


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