|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Echinoidea - Arbacioida
It was corrected as Arbacioida by Fell and Pawson (1966), Linder et al. (1988), Donovan (1993), Smith (1995), Berndt (2003), Smith (2009) and Kroh and Smith (2010).
It was assigned to Echinacea by Fell and Pawson (1966); to Acroechinoidea by Smith (1995); to Echinoidea by Linder et al. (1988), Donovan (1993), Berndt (2003) and Smith (2009); and to Echinacea 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.