|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Ophiuroidea - Ophiurida
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.
|H. Matsumoto 1915||Radial shield and genital plate articulate with each other by means of a transverse ridge or a simple facet on either plate, without well-developed articular condyles and sockets. Peristomal plates large, usually entire. Oral frames entire, without well-developed lateral wings. Dorsal arm plates often very small, while the lateral arm plates are very well developed, those of opposite sides usually meeting both above and below.|