Fig. 2From: Gymnodiadema and the Jurassic roots of the Arbacioida (stirodont echinoids)Gymnodiadema hessi sp. nov. NHM EE13923 (holotype), Bajocian, Enjil, Morocco. a Lateral view (ambulacral), b lateral view (interambulacral), c oral view, d apical view. Scale bar 10 mmBack to article page