Pinna nobilis, Noble pen shell
Noble Pen Shell (Pinna nobilis) · iNaturalist United Kingdom
Steckmuschel_Pinna_nobilis2.png
Pinna (bivalve) - Wikipedia
Pinna nobilis Noble pen shell, Fan mussel, Sea-wings
Pinna nobilis - Alchetron, The Free Social Encyclopedia
Half a giant mussel shell found somewhere in the Mediterranean, I don't remember where it was a long time ago, identification? : r/marinebiology
Noble Pen Shell (Pinna nobilis) · iNaturalist United Kingdom
Pinna (bivalve) - Wikipedia
Marine Explorers Society 20.000 leagues