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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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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.