Classification
provided by World Register of Marine Species
Although represented here as sister groups, Acroechinoidea, Carinacea and Irregularia actually form a set of nested clades (see image below). Due to the limitations of WoRMS this cannot be reflected in the database at present.
Kroh, A. & Smith, A.B. (2010): The phylogeny and classification of post-Palaeozoic echinoids. Journal of Systematic Palaeontology, 8/2: 147-212.
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