|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Asteroidea - Valvatida - Sphaerasteridae
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. Hess 1994||Body form pentagonal, highly inflated, domed. Oral face flat. Marginal plates not differentiated. Both sides completely covered with closely set ossicles, indented for papulae. Dorsal plates around center of disc irregularly polygonal, some indented for papulae, but most of them closely inter-fingered. Other abactinal plates transversally elongate and high, arranged in regular rows. Spines absent from abactinals. Actinals radially elongate, imbricated in central area and very high towards margin, surface covered with granules. Adambulacrals compact, not projecting into furrow, with tuft of small spines.|