Isorophida

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.^[4]

Phylum:Echinodermata

Class:†Edrioasteroidea

Order:†Isorophida
Bell 1974

Quick facts Scientific classification, Suborders and Families ...

Isorophida Temporal range: 488.3–272.5 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Lepidodiscus, an agelacrinitid isorophid
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	†Edrioasteroidea
Order:	†Isorophida Bell 1974
Suborders and Families
†Isorophina[1][2] †Isorophidae †Agelacrinitidae †Lebetodiscina[3] †Lebetodiscidae †Carneyellidae incertae sedis †Pyrgocystidae[1]

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Isorophids are the most common order of edrioasteroids.^[4]