|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
It was assigned to Goniactinida by Sepkoski (2002); to Archegonasteridae by Spencer (1951), Owen (1965), Spencer and Wright (1966) and Dean Shackleton (2005); and to Somasteroidea by Blake (2013).
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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.
|J. Dean Shackleton 2005||Loss of podial basin; radial water vessel uncovered; podial floor absent; transverse contact between adjacent ambulacral ossicles overlapping; oral ambulacral perradial region ending in proximal and distal rounded tongue; adambulacrals with groove spines; adjacent inferomarginals abut; inferomarginals possess virgal-like facets; madreporite dorsal to inferomarginals; aboral surface granulated; aboral plating absent.|