|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Somasteroidea - Goniactinida - Catervaparmasteridae
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 2000||Somasteroids lacking adambulacral ossicles or adambulacral virgals at least medially and distally on the arm; marginal robust, flattened, each with one or more well-defined transverse ridges that abut one or more ambulacrals of the arm (or potentially virgals on the disc); virgals, if present, confined to disc region; mouth frame and dorsal skeleton unknown.|