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It was reranked as the order Cidaroidea by Smith (1991), Smith (2009) and Kroh and Smith (2010); it was reranked as the subclass Cidaroidea by Smith (1995) and Smith (2015).
It was assigned to Regularia by Clark and Twitchell (1915); and to Echinoidea by Grant and Hertlein (1938), Smith (1991), Smith (1995), Hagdorn (1995), Smith (2009), Kroh and Smith (2010) and Smith (2015).
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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.