|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Cephalopoda - Protocycloceratidae
It was assigned to Endocycloceratidae by Ulrich et al. (1944); to Protocycloceratidae by Flower (1964) and Teichert et al. (1964); and to Ellesmerocerida 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.