Pinna is a genus of bivalve molluscs belonging to the family Pinnidae.
Pinna (bivalve)
Pinna noblis shell & byssus.
Shell.
Pinna angustana
Pinna nobilis, whose common name is the noble pen shell or fan mussel, is a large species of Mediterranean clam, a marine bivalve mollusc in the family Pinnidae, the pen shells.
Pinna nobilis
Live specimen of Pinna nobilis, in Levanto, Liguria
Pinna nobilis in a Mediterranean seagrass meadow
Live specimen of P. nobilis, looking into the shell from above