|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Echinoidea - Spatangoida - Brissidae
It was reranked as Eupatagus (Plagiobrissus) by Cooke (1942).
It was assigned to Eupatagus by Cooke (1942); to Echinoidea by Durham (1961); to Brissidae by Fischer (1966); and to Spatangoida 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.