|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Echinoidea - Pseudodiadematidae
It was assigned to Hemicidaridae by Fell and Pawson (1966); to Heterodiadematidae by Smith (1995); to Hemicidaroida by Sepkoski (2002); and to Pseudodiadematidae by Berndt (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.