Project 5123: T. Saucede, D. Neraudeau. 2006. An â 'Elvisâ' echinoid, Nucleopygus (Jolyclypus) jolyi, from the Cenomanian of France: phylogenetic analysis, sexual dimorphism and neotype designation. Cretaceous Research. 27 (4):542-554.
This project has 14 specimens.