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|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Ophiuroidea - Cheiropterasteridae
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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.
|P. A. Jell and J. N. Theron 1999||Body large; disc uncalcified, extending to arm tips. Arms slightly petaloid. Ambulacrals cylindrical with lateral projection (or toe of boot) shorter than radial length. Adambulacrals wide (ad-ab), expanded abradially to be T-shaped, with single very strong lateral spine on each adambulacral. Madreporite interradial, close to mouth frame on ventral surface. Mouth frame small for size of animal, plates not massive, with well-developed podial basin on 2nd ambulacral. Mouth large, with short buccal slit between 1st 2 ambulacrals.|