|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Trilobita - Ptychopariida - Ellipsocephalidae
It was assigned to Trilobita by Lochman (1956); to Ellipsocephalinae by Ahlberg (1980); to Ptychopariida by Sepkoski (2002); and to Ellipsocephalidae by Jell and Adrain (2003).
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.