|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Craniata - Craniida - Craniidae
It was reranked as Crania (Pseudocrania) by Winchell (1866).
It was assigned to Crania by Winchell (1866); to Craniidae by Williams et al. (2000); and to Acrotretida 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.