|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
It was assigned to Zoroasteridae by Hess (1974); to Forcipulatida by Sepkoski (2002); to Forcipulatacea by Villier et al. (2009); and to Terminasteridae by Gale (2011) and Gale (2011).
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 1974||Size small. Form stellate with reduced disc and cylindrical arms. Primary plates of the disc clearly differentiated with one centrodorsal and a crown of radial and interradial plates. Plates of the arm large, aligned in well-defined rows (radial, superomarginal and inferomarginal plates) and each plate with a spine. Few Additional and reduced abactinal plates intercalated between radial and superomarginal plates. Adambulacral plates all of the same shape, with ornament of two spines. Two rows of podia. Mouth angle plate with a large oral spine. First adambulacral plates of adjoining arms in contact interbrachially. Terminal plate very large with aligned tubercles for articulation of spines on oral margins and smaller tubercles on the dorsal side. Pedicellariae absent.|