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Order Aspidodiadematoida Kroh & Smith, 2010, p. 170

Diagnosis	Acroechinoidea with: subglobular test apical disc monocyclic with ocular and genital plates similar in size and set in a membranous periproct; plates not attached to the corona ambulacral plating acrosaleniid in triads at least adorally and with some elements united by tubercle overgrowth interambulacral plates with single large tubercle; perforate and crenulate sphaeridia present in shallow pits on every third element from peristome to apex peristome large; buccal notches shallow and rounded spines with central lumen crossed by partitions and fine needle-like pillars.
Range	Lower Jurassic to Recent
Type	Aspidodiadema
Species Included	Contains only the Family Aspidodiadematidae
Classification and/or Status	Euechinoidea, Acroechinoidea
Remarks	Kroh, A. & Smith, A. B. 2010. The phylogeny and classification of post-Palaeozoic echinoids. Journal of Systematic Palaeontology 8, 147-212.