Rotularia Temporal range: (Jäger, 2004)
Rotularia concava fossil
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Annelida
Clade:	Pleistoannelida
Subclass:	Sedentaria
Order:	Sabellida
Family:	Serpulidae
Genus:	†Rotularia Defrance, 1827

Rotularia is an extinct genus of planispirally coiled fossil polychaete worms in the family Serpulidae. Owing to the gastropod-like shape of Rotularia, many authors in the past interpreted this genus as being sea snails in the family Vermetidae. Like many other members from Vermetidae the Rotularia is approximately 5 inches in length. This is an estimate from the 151 confirmed fossil discoveries.

All Rotularia species were cemented to the substrate during their earliest growth stage, but they became detached shortly after the formation of the first whorls (Savazzi, 1995). Their tubes have two layers with different microstructure (Vinn, 2008). This genus is known from the early Kimmeridgian to Late Eocene (Jäger, 2004).

References

• Jäger, M. 2004. Serpulidae und Spirorbidae (Polychaeta sedentaria) aus Campan und Maastricht von Norddeutschland, den Niederlanden, Belgien und angrenzenden Gebieten. Geologisches Jahrbuch (A) 157, 121–249.
• Savazzi, E. 1995. Morphology and mode of life of the polychaete Rotularia. Paläontologische Zeitschrift 69, 73–85.
• Vinn, O. (2008). "Tube ultrastructure of the fossil genus Rotularia Defrance, 1827 (Polychaeta, Serpulidae)". Journal of Paleontology. 82: 206–212. doi:10.1666/06-125.1. S2CID 129387553. Retrieved 2014-06-12.