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Echinoidea - Orthopsidae
It was reranked as the family Orthopsidae by Fell and Pawson (1966), Geys and Jagt (1986), Smith (1991), Smith (1995) and Kroh and Smith (2010).
It was assigned to Echinacea by Smith (1991); to Orthopsida by Fell and Pawson (1966), Geys and Jagt (1986) and Smith (1995); and to Carinacea by Kroh and Smith (2010).
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.