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Gymnodiadema hessi Smith, 2011, p. 169

Diagnostic Features	Differs from G. choffati  in lacking two clearly defined marginal columns of interambulacral tubercles running parallel to the ambulacra in the subambital region.
Distribution	Upper Bajocian, Middle Jurassic, Morocco
Type	BMNH EE13923
Classification and/or Status	A species of Gymnodiadema
Remarks	Smith, A.B. 2011. Gymnodiadema and the Jurassic roots of the Arbacioida (stirodont echinoids). Swiss Journal of Palaeontology 130, 155-171.