| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Billingsella (Otusia)
Taxonomy
Billingsella (Otusia) was named by Walcott (1905) [Sepkoski's age data: Cm Fran Sepkoski's reference number: 1]. Its type is Orthis sandbergi.
It was reranked as Otusia by Walcott (1912), Williams et al. (2000), Sepkoski (2002).
It was assigned to Billingsella by Walcott (1905); to Billingsellidae by Walcott (1912); to Eoorthidae by Williams et al. (2000); and to Orthida by Sepkoski (2002).
It was reranked as Otusia by Walcott (1912), Williams et al. (2000), Sepkoski (2002).
It was assigned to Billingsella by Walcott (1905); to Billingsellidae by Walcott (1912); to Eoorthidae by Williams et al. (2000); and to Orthida by Sepkoski (2002).
Subtaxa
Species lacking formal opinion data