Echinoidea - Irregularia - Nucleolitidae
Full reference: L. Agassiz and P. J. E. Desor. 1847. Catalogue raisonné des familles, des genres, et des espèces de la classe des échinodermes. Annales des Sciences Naturelles, Troisième Série, Zoologie 7-8
Parent taxon: Neognathostomata according to A. Kroh and A. B. Smith 2010
See also Clark and Twitchell 1915, Donovan 1993, Kier 1962, Kier 1966 and Smith 1991
Sister taxa: Apatopygidae, Archiaciidae, Bothryopneustes, Cassiduloida, Clypeasteroida, Clypeidae, Clypeolampadidae, Echinolampadoida, Pygaulidae
Subtaxa: Clypeopygus Hemicara Heteronucleus Hypopygurus Nucleolites Oolopygus Phyllobrissus Plagiochasma Pseudonucleus Pseudosorella Pygaulus Pygopistes Pygorhynchus
Ecology: epifaunal grazer-deposit feeder
Distribution:
• Miocene of United States (1: North Carolina collection)
• Eocene of Cuba (2)
• Paleocene of Argentina (1), Austria (1), Denmark (1), Libya (1), United States (10: Alabama, Georgia, New Jersey)
• Cretaceous to Paleogene of the Netherlands (1)
• Cretaceous of Angola (2), Belgium (8), Brazil (1), Chile (1), Egypt (4), France (84), Gabon (1), Israel (1), Jamaica (2), Mozambique (1), the Netherlands (7), Peru (2), Portugal (6), Saudi Arabia (1), Spain (3), Switzerland (20), USSR (2), the United Kingdom (6), United States (4: New Jersey, Texas)
• Jurassic of Armenia (1), France (11), Germany (2), Lebanon (1), Poland (8), Saudi Arabia (2), Switzerland (1), Tunisia (1), the United Kingdom (35)
Total: 236 collections including 322 occurrences