|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
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.
|J. Dean Shackleton 2005||Ambulacral proximal podial flange with tongue overlapping distal flange; transverse contact of adjacent ambulacrals overlapping; perradial bars of ambulacrals in oral view end in rounded tongues; inferomarginal ossicles bear spines; madreporite in contact with inferomarginal ossicle; actinal ossicles stellate and aligned; bucal slits present; dental plate absent.|