|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Edrioasteroidea - Isorophida - Agelacrinitidae
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.
|T. E. Guensberg 1988||Isorophina with low domal theca, short straight ambulacra; oral area includes four large primary orals; ambulacral coverplates probably forming alternating multiple biseries; anal structure valvular, cone shaped, composed of upturned lath-shaped plates; interambulacrals not abutting, consist of tacklike spinose plates interspersed with small ovoid plates; proximal peripheral rim circlet comprised of large exteriorly curved plate ring, plates mutually articulating along vertical sutures; succeeding peripheral rim plates spinose.|