Neoplagiaulacidae is a family of mammal within the extinct order Multituberculata. Fossil remains are known from the Upper Cretaceous through to the latest Eocene/early Oligocene. Representatives have been found in North America, Europe and Asia. They are the last multituberculates known.[3]

Temporal range: Late Cretaceous–Early Oligocene
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Multituberculata
Superfamily: Ptilodontoidea
Family: Neoplagiaulacidae

Neoplagiaulacinae (Ameghino 1890) has been seen as a sub-family within Ptilodontidae (Cope, 1887). More recent thinking has it as a family. Synonyms are Ectypodidae (Sloan & Van Valen 1965) and Ectypodontidae (Sloan & Van Valen 1965). Most fossils are restricted to teeth. The family is part of the suborder of Cimolodonta within the superfamily of Ptilodontoidea.


  1. Hunter, J. P, Heinrich, R. E., and Weishampel, D. B. (2010). "Mammals from the St. Mary River Formation (Upper Cretaceous), Montana". Journal of Vertebrate Paleontology. 30 (3): 885–898. doi:10.1080/02724631003763490.CS1 maint: multiple names: authors list (link)
  2. Wilson, G. P., Dechesne, M., and Anderson, I. R. (2010). "New Late Cretaceous mammals from northeastern Colorado with biochronologic and biogeographic implications". Journal of Vertebrate Paleontology. 30 (2): 499–520. doi:10.1080/02724631003620955.CS1 maint: multiple names: authors list (link)
  3. Karew Schumaker, Multituberculates from the Medicine Pole Hills Local Fauna (Chadronian) of Bowman County, North Dakota


  • Ameghino (1890). "Los plagiaulácidos Argentinos y sus relaciones zoológicas, geológicas y geográficas". Boletin del Instituto Geográfico Argentino. 11: 143–208.
  • Kielan-Jaworowska Z.; Hurum J.H. (2001). "Phylogeny and Systematics of multituberculate mammals". Palaeontology. 44 (3): 389–429. doi:10.1111/1475-4983.00185.