|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Orthothecida - Circothecidae
It was assigned to Orthothecidae by Fisher (1962); to Circothecidae by Rozanov et al. (1969) and Azmi and Pancholi (1983); to Hyolitha by Malinky (1990); and to Circothecida by Sepkoski (2002).
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.