Temporal range: Late Jurassic
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Multituberculata
Family: Allodontidae (?)
Genus: Morrisonodon
Hahn & Hahn, 2004
M. brentbaatar
Binomial name
Morrisonodon brentbaatar
(Bakker, 1998)

Ctenacodon brentbaatar

Morrisonodon brentbaatar is an extinct multituberculate mammal from the Upper Jurassic Morrison Formation of North America.

M. brentbaatar was described by Robert T. Bakker in 1998, who originally placed it in the genus Ctenacodon. The fossil remains consist of a jaw fragment containing two upper premolars and the sockets corresponding to two molars. The remains were found in the Upper Jurassic Morrison Formation in Wyoming. The species name honours the Wyoming paleontologist Brent Breithaupt, while "Baatar" is a Mongolian for "hero".[1]

Bakker assigned his specimens to Ctenacodon with hesitation, noting additional specimens may require a new classification.[1] In a 2001 review of multituberculates, Zofia Kielan-Jaworowska and Jørn Hurum did not recognize Bakker's specimen as related to other Ctenacodon species or even belonging to the family Allodontidae, speculating the species might instead belong to the family Plagiaulacidae.[2] In 2004, the species was placed in the newly established genus Morrisonodon.[3]


  1. ^ a b Bakker, R.T. (1998). "Dinosaur mid-life crisis: the Jurassic-Cretaceous transition in Wyoming and Colorado". In S.G. Lucas; J.I. Kirkland; J. Estep (eds.). Lower and Middle Cretaceous terrestrial ecosystems. New Mexico Museum of Natural History Bulletin. Vol. 14. pp. 67–77.
  2. ^ Kielan-Jaworowska, Zofia; Hurum, Jorn H. (2001). "Phylogeny and Systematics of Multituberculate Mammals". Palaeontology. 44 (3): 389–429. doi:10.1111/1475-4983.00185.
  3. ^ Hahn, G., & Hahn, R. (2004). "The dentition of the Plagiaulacida (Multituberculata, Late Jurassic to Early Cretaceous)". Geologica et Palaeontologica. 38: 119–159.{{cite journal}}: CS1 maint: uses authors parameter (link)