The Echinoid Directory
Guittonicidaris bigoti (Mercier, 1930); Upper Callovian, Middle Jurassic, Mortagne, Orne, France. From Vadet, A. 1991. Revision des "Cidaris" du Lias et du Dogger Europeens. Memoires de la Societe academique du Boulonnais 10, 1-176: pl. 9, fig. 1. Lateral view.
Diameter of test 34 mm.