|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
It was reranked as the suborder Phymosomatoida by Fell and Pawson (1966), Linder et al. (1988), Smith (1991), Smith (1995), Sepkoski (2002), Manso and Andrade (2008) and Kroh and Smith (2010).
It was assigned to Echinacea by Fell and Pawson (1966); to Stirodonta by Smith (1991); to Acroechinoidea by Smith (1995); to Echinoidea by Linder et al. (1988), Sepkoski (2002) and Manso and Andrade (2008); and to Calycina by Kroh and Smith (2010).
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