> [!summary]- Classification
**Kingdom**:: [Animalia](Animalia.md)
**Phylum**:: [Mollusca](Mollusca.md)
**Subphylum**::
**Superclass**::
**Class**:: [Bivalvia](Bivalvia.md)
**Subclass**:: Pteriomorphia
**Superorder**::
**Order**:: Pterioida
**Suborder**::
**Superfamily**::
**Family**:: Pinnidae
**Subfamily**::
**Genus**:: Pinna
**Species**:: P. rudis
**Vernacular**:: Rough pen shell
## Photos
*[139 - 2023-11-12 - Les Rosiers - La Ciotat - France](139%20-%202023-11-12%20-%20Les%20Rosiers%20-%20La%20Ciotat%20-%20France.md) - The picture isn't really great as we can't distinct shapes, but it's a Pinna rudis with a lot of epibiont on it.*
## Notes
Can be differentiate from the [Pinna nobilis - Fan mussel](Pinna%20nobilis%20-%20Fan%20mussel.md) because of its size and its shell epibiont's. P. rudis is smaller and with a lof spines (kind of) and scales things living on its shell.
## References
- https://doris.ffessm.fr/Especes/Pinna-rudis-Nacre-epineuse-1126
- [Découvrir la vie sous-marine - Méditerranée - Steven Weinberg](Découvrir%20la%20vie%20sous-marine%20-%20Méditerranée%20-%20Steven%20Weinberg.md) p305