|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Asteroidea - Hemizonida
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.
|D. B. Blake and T. E. Guensburg 1989||Multiarmed asteroid; abactinal sturdy; marginals closely arranged, interdigitate, thickened, with smaller granular ossicles distributed among larger; ambulacrals and adambulacrals stout with large podial basins; adambulacrals tansversely rounded, wide distally on arm but narrowed proximally, approximately first eight abutted across interbrachium to form adoral carina; orals large, smooth, keel-like, with large torus bearing prominent spines fitted between oral pair.|