|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Cephalopoda - Protocycloceratidae
It was assigned to Spyroceratidae by Ulrich et al. (1944); and to Protocycloceratidae by Teichert et al. (1964), Hook and Flower (1977), Kröger and Landing (2009) and Evans (2011).
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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.