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Subclass Euechinoidea Bronn, 1860

Diagnosis	Crown group Echinoidea with Test composed of just 10 columns of plates Lantern with deep foramen magnum in pyramids (absent in derived irregular echinoids) Perignathic girdle dominated by ambulacral elements (absent in derived irregular echinoids that lack a lantern) Ambulacral plating typically compound with multiple elements fused together (absent in derived irregular echinoids) Sphaeridia present Triphyllous and globiferous pedicellariae generally present
Species Included	Clade including all living regular and irregular echinoids except the Cidaroidea
Remarks	The following taxa were established on material so poor as to be indeterminate, but which is probably euechinoid: Ancyclocidaris Miller, 1929 Dallonia Lambert, in Dallon, 1920 Macrodiadema Lambert, 1897 Mizunamia Ishijima & Hatai, 1973 Kroh, A. & Smith, A. B. 2010. The phylogeny and classification of post-Palaeozoic echinoids. Journal of Systematic Palaeontology 8, 147-212. Bronn, H. G. 1860. Die Klassen und Ordnungen des Thier-Reichs, wissenschaftlich dargestellt in Wort und Bild. Zweiter Band, Actinozoen. C. F. Winter'sche, Leipzig. 434 pp.