|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Stenuroidea - Antiquasteridae
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.
|R. V. Kesling 1971||Ophiuroids with arms composed of well-developed rows of Ambb, SubLL, and LL plates. No ventral plates. Ambulacrum more of a surface than a groove. Ambb opposites, pairs forming low, weakly articulated series of vertebrae. LL far removed from Ambb, incapable of forming a deep narrow channel upon contraction of muscles. Cups for tube feet distinct but without aboral confining wall. Buccal slit reduced to wall notch. Interradii deeply incised between arms. MAPP strongly developed. Disk small, no interbrachial extensions.|