> [!summary]- Classification
**Kingdom**:: [Animalia](Animalia.md)
**Phylum**:: [Annelida](Annelida.md)
**Subphylum**::
**Superclass**::
**Class**:: Polychaeta
**Subclass**:: Sedentaria
**Superorder**::
**Order**:: Sabellida
**Suborder**::
**Superfamily**::
**Family**:: Serpulidae
**Subfamily**::
**Genus**:: Protula
**Species**:: P. tubularia
**Vernacular**:: Smooth calcareous tube-worm
## Photos
*[123 - 2023-05-15 - L'Aquarium I - Epidaurus - Greece](123%20-%202023-05-15%20-%20L'Aquarium%20I%20-%20Epidaurus%20-%20Greece.md) - The horseshoe shape can help recognize Protula over Serpula*
*[124 - 2023-05-15 - L'Aquarium II - Epidaurus - Greece](124%20-%202023-05-15%20-%20L'Aquarium%20II%20-%20Epidaurus%20-%20Greece.md) - Like the other fanworm, the fan can have different colors, but we still get those dots that can be use as an identification key.*
## Notes
The Protula, compared to the Serpula, doesn't have any operculum to close their tube's entrance.
Also, compared to the Sabella (such as [Sabella spallanzanii - Mediterranean fanworm](Sabella%20spallanzanii%20-%20Mediterranean%20fanworm.md)) have calcareous, rigid tube. Sabella have flexible tube, made of mucus and sticked sediments, such as sand particles.
## References
- https://doris.ffessm.fr/Especes/Protula-tubularia-Protule-lisse-280