|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 by means of a conspicuous socket in the former and of a large, ball-like condyle on the latter. Genital plates, as a rule, firmly fixed to the basal vertebrae. Genital scales short, very wide, flattened, leaf-like. On abradial side of innermost part of each genital slit occurs another short, wide, flattened, leaf-like scale, which is firmly attached to oral shield. Peristomal plates small, or rarely large, usually entire, but. sometimes double. Oral frames, as a rule, with well-developed lateral wings.|