# Morrisonodon

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Extinct species of mammal

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

***Morrisonodon brentbaatar*** is an extinct [multituberculate mammal](/source/Multituberculata) from the [Upper Jurassic](/source/Upper_Jurassic) [Morrison Formation](/source/Morrison_Formation) of North America.

*M. brentbaatar* was described by [Robert T. Bakker](/source/Robert_T._Bakker) in 1998, who originally placed it in the genus *[Ctenacodon](/source/Ctenacodon)*. The fossil remains consist of a jaw fragment containing two upper [premolars](/source/Premolar) and the sockets corresponding to two molars. The remains were found in the Upper Jurassic [Morrison Formation](/source/Morrison_Formation) in [Wyoming](/source/Wyoming). The species name honours the Wyoming paleontologist Brent Breithaupt, while "Baatar" is a [Mongolian](/source/Mongolian_language) 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](/source/Zofia_Kielan-Jaworowska) and [Jørn Hurum](/source/J%C3%B8rn_Hurum) did not recognize Bakker's specimen as related to other *Ctenacodon* species or even belonging to the family [Allodontidae](/source/Allodontidae), speculating the species might instead belong to the family [Plagiaulacidae](/source/Plagiaulacidae).[2] In 2004, the species was placed in the newly established genus *Morrisonodon*.[3]

## References

1. ^ [***a***](#cite_ref-Bakker1998_1-0) [***b***](#cite_ref-Bakker1998_1-1) Bakker, R.T. (1998). ["Dinosaur mid-life crisis: the Jurassic-Cretaceous transition in Wyoming and Colorado"](http://econtent.unm.edu/cdm/compoundobject/collection/bulletins/id/960). 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.

1. **[^](#cite_ref-K-J&H2001_2-0)** Kielan-Jaworowska, Zofia; Hurum, Jorn H. (2001). ["Phylogeny and Systematics of Multituberculate Mammals"](http://doc.rero.ch/record/14775/files/PAL_E1903.pdf) (PDF). *Palaeontology*. **44** (3): 389–429. [doi](/source/Doi_(identifier)):[10.1111/1475-4983.00185](https://doi.org/10.1111%2F1475-4983.00185). [S2CID](/source/S2CID_(identifier)) [83592270](https://api.semanticscholar.org/CorpusID:83592270).

1. **[^](#cite_ref-Hahn&Hahn2004_3-0)** Hahn, G.; Hahn, R. (2004). "The dentition of the Plagiaulacida (Multituberculata, Late Jurassic to Early Cretaceous)". *Geologica et Palaeontologica*. **38**: 119–159.

v t e Allotheria Kingdom: Animalia Phylum: Chordata Class: Mammalia Clade: Theriiformes Synapsida see Synapsida Cynodontia see Cynodontia Mammalia see Mammalia Allotheria see below↓ Allotheria †Allotheria Haramiyida? Gondwanatheria? Adalatherium Groeberiidae? Ferugliotheriidae? Argentodites? Ferugliotherium LACM 149371? Magallanodon Trapalcotherium Sudamericidae Bharattherium Galulatherium Gondwanatherium Greniodon? Lavanify Patagonia? Sudamerica Vintana Multituberculata Argillomys Baidabatyr? Hahnotherium Janumys Tagaria Tashtykia Gondwanatheria? Hahnodontidae? Allodontoidea Arginbaatar Glirodon Zofiabaatar Allodontidae Ctenacodon Passumys Psalodon Paulchoffatioidea Pinheirodontidae Bernardodon Bructerodon Cambelodon Cantalera Ecprepaulax Gerhardodon Iberodon Lavocatia Pinheirodon Paulchoffatiidae Angrivarodon Bathmochoffatia Cimbriodon Galveodon Guimarotodon Henkelodon Kielanodon Kuehneodon Meketibolodon Meketichoffatia Parendotherium? Paulchoffatia Plesiochoffatia Pseudobolodon Renatodon Rugosodon Sunnyodon Xenachoffatia Plagiaulacoidea Plagiaulacidae Bolodon Morrisonodon Novaculadon Plagiaulax Eobaataridae Cheruscodon Dolichoprion Eobaatar Hakusanobaatar Heishanobaatar Iberica Indobaatar Jeholbaatar Liaobaatar Loxaulax Monobaatar? Nokerbaatar Parendotherium? Sinobaatar Tedoribaatar Teutonodon Albionbaataridae Albionbaatar Kielanobaatar Proalbionbaatar Cimolodonta see below↓ Cimolodonta Cimolodonta Allocodon Ameribaatar Boffius Corriebaatar Fractinus Halodon Koshikibaatar Uzbekbaatar Viridomys Gondwanatheria? Paracimexomys group Bryceomys Cedaromys Cimexomys Dakotamys Paracimexomys Cimolomyidae Buginbaatar Camurodon Cimolomys Essonodon Meniscoessus Paressodon Parikimys Kogaionidae Barbatodon Hainina Kogaionon Litovoi Eucosmodontidae Clemensodon Eucosmodon Stygimys Microcosmodontidae Acheronodon Golercosmodon Kaniqsiqcosmodon Microcosmodon Pentacosmodon Ptilodontoidea Filikomys Neoliotomus Cimolodontidae Anconodon Cimolodon Liotomus Neoplagiaulacidae Cernaysia Ectypodus Krauseia Mesodma Mesodmops Mimetodon Neoplagiaulax Nidimys Notopolytheles? Parectypodus Paressonodon Xanclomys Xyronomys Ptilodontidae Aenigmamys Baiotomeus Kimbetohia Prochetodon Ptilodus Taeniolabidoidea Bubodens? Catopsalis Erythrobaatar Valenopsalis Yubaatar Lambdopsalidae Lambdopsalis Prionessus Sphenopsalis Taeniolabididae Kimbetopsalis Taeniolabis Djadochtatherioidea Bulganbaatar Chulsanbaatar Nemegtbaatar Sloanbaataridae Kamptobaatar Nessovbaatar Sloanbaatar Djadochtatheriidae Catopsbaatar Djadochtatherium Guibaatar Kryptobaatar Mangasbaatar Qayaqgruk Tombaatar See also: Plagiaulacida Category

Taxon identifiers Morrisonodon Wikidata: Q3699002 GBIF: 9495027 IRMNG: 1475343

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Adapted from the Wikipedia article [Morrisonodon](https://en.wikipedia.org/wiki/Morrisonodon) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Morrisonodon?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.