Isorophida
| Isorophida Temporal range:
| |
|---|---|
| Lepidodiscus, an agelacrinitid isorophid | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | †Edrioasteroidea |
| Order: | †Isorophida Bell 1974 |
| Suborders and Families | |
| |
Isorophida is an extinct order of prehistoric echinoderms in the class Edrioasteroidea. Isorophids are characterized by a disc-shaped, dome-shaped or club-shaped theca with ambulacra typically limited to the upward-facing oral surface which is bordered by an peripheral rim that flares outward parallel to the substrate. The aboral (substrate-facing) surface is unplated.
Isorophids are the most common order of edrioasteroids.