†Nucleopygus (Jolyclypus) Lambert 1918 (sea urchin)
Echinoidea - Cassiduloida - Cassidulidae
Alternative spelling: Jolyclypus
Parent taxon: Nucleopygus according to T. Saucède and D. Néraudeau 2006
See also Kier 1962 and Kier 1966
Sister taxa: Nucleopygus magnus, Nucleopygus minor, Nucleopygus pullatus, Nucleopygus scrobiculatus, Nucleopygus similis, Nucleopygus texanus
Subtaxa: none
Ecology: slow-moving semi-infaunal detritivore
Distribution:
• Cretaceous of France (2 collections)
Total: 2 collections each including a single occurrence