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Mesodma Temporal range: 83.6–56 Ma PreꞒ Ꞓ O S D C P T J K Pg N Possible Cenomanian record
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	†Multituberculata
Family:	†Neoplagiaulacidae
Genus:	†Mesodma
Species
M. ambigua M. formosa M. hensleighi M. pygmaea M. senecta M. thompsoni

Mesodma is an extinct genus of mammal, a member of the extinct order Multituberculata within the suborder Cimolodonta, family Neoplagiaulacidae. It lived during the upper Cretaceous and Paleocene Periods of what is now North America. The earliest definitive record is from the late Santonian stage strata of the Straight Cliffs Formation. A single premolar tooth from the lower Cenomanian stage strata of the Cedar Mountain Formation has been tentatively assigned to this genus based on its similarity, but its describers noted that it is unlikely that Mesodma lived during that time.

Species

• Mesodma ambigua
  • Place: Mantua Lentil, Wyoming (USA)
  • Age: Maastrichtian-Puercan, Upper Cretaceous - Paleocene
  • Weight: about 55 g
• Mesodma formosa
  • Place: Hell Creek and Frenchman Formation, USA & Canada. This species is possibly also known from Utah.
  • Age: Maastrichtian-Puercan (Upper Cretaceous to the Paleocene).
  • Weight: about 30 g
• Mesodma hensleighi
  • Place: Hell Creek Formation in the U.S. and in Saskatchewan, Canada.
  • Age: Maastrichtian (Upper Cretaceous).
  • Weight: around 15 g
• Mesodma pygmaea
  • Place: Gidley Quarry, Montana, as well as Wyoming and Alberta, Canada
  • Age: Torrejonian-Tiffanian (Middle Paleocene).
  • Weight: about 8 g
• Mesodma senecta
  • Age: Campanian (Upper Cretaceous)
  • Weight: about 50 g
• Mesodma thompsoni (=M. garfieldensis)
  • Place: St Mary River Formation & Montana and Wyoming of the US and Canada
  • Age: Maastrichtian-Puercan, Upper Cretaceous - Paleocene
  • Weight: about 55 g

The species "Mesodma" primaeva from the Judithian of Western Interior of North America was formerly assigned to the genus Mesodma, but subsequently it was made the type species of a separate genus Filikomys.

References

1. Eaton, Jeffrey G. (12 June 2006). "Santonian (late Cretaceous) mammals from the John Henry Member of the Straight Cliffs Formation, Grand Staircase-Escalante National Monument, Utah". Journal of Vertebrate Paleontology. 26 (2): 446–460. doi:10.1671/0272-4634(2006)26[446:SLCMFT]2.0.CO;2. S2CID 130526200.
2. Eaton, Jeffrey G.; Cifelli, Richard L. (2001). "Multituberculate mammals from near the Early-Late Cretaceous boundary, Cedar Mountain Formation, Utah". Acta Palaeontologica Polonica. 46 (4): 453–518. S2CID 129909933.
3. Smith, Stephanie M.; Wilson, Gregory P. (2016). "Species Discrimination of Co-Occurring Small Fossil Mammals: A Case Study of the Cretaceous-Paleogene Multituberculate Genus Mesodma". Journal of Mammalian Evolution. 24 (2): 147–157. doi:10.1007/s10914-016-9332-2. S2CID 254703663.
4. Weaver, Lucas N.; Varricchio, David J.; Sargis, Eric J.; Chen, Meng; Freimuth, William J.; Wilson Mantilla, Gregory P. (2020). "Early mammalian social behaviour revealed by multituberculates from a dinosaur nesting site". Nature Ecology & Evolution. 5 (1): 32–37. doi:10.1038/s41559-020-01325-8. PMID 33139921. S2CID 226241443.

Further reading

• Osborn (1891); "A review of the Cretaceous Mammalia". Proc. Acad. Nat. Sci. Phila. 124 - 135.
• Simpson (1929), "American Mesozoic Mammalia". Mem. Peabody Mus. Nat. Hist. iii (i): p. 1-235.
• Clemens (1963), "Fossil mammals of the type Lance formation Wyoming. Part I. Introduction and Multituberculata". Univ. Calif. Pub;. Geol. Sci. 48, p. 1-105. (According to Peabody Museum database.)
• Marsh (1889), "Discovery of Cretaceous Mammalia". Am. J. Sci. (3) xxxviii, p. 177-180.
• Archibald (1982), A study of Mammalia and geology across the Cretaceous-Tertiary boundary in Garfield County, Montana. Univ. of Calif. Publ. Geol. Sci. 122xvi+, 286pp.
• Jepsen (1940), "Paleocene faunas of the Polecat Bench formation, Park County, Wyoming". Pro. Amer. Philos. Soc 83, p. 217-341, 21 figs., 5 pls.
• Kielan-Jaworowska, Z; Hurum, JH (2001). "Phylogeny and Systematics of multituberculate mammals" (PDF). Palaeontology. 44 (3): 389–429. doi:10.1111/1475-4983.00185. S2CID 83592270.

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 Cantalera Ecprepaulax Gerhardodon Iberodon Lavocatia Pinheirodon Paulchoffatiidae Bathmochoffatia Galveodon Guimarotodon Henkelodon Kielanodon Kuehneodon Meketibolodon Meketichoffatia Paulchoffatia Plesiochoffatia Pseudobolodon Renatodon Rugosodon Sunnyodon Xenachoffatia Plagiaulacoidea Plagiaulacidae Bolodon Morrisonodon Plagiaulax Eobaataridae Cheruscodon Dolichoprion Eobaatar Hakusanobaatar Heishanobaatar Iberica Indobaatar Liaobaatar Loxaulax Monobaatar? Nokerbaatar Parendotherium Sinobaatar Tedoribaatar Teutonodon Albionbaataridae Albionbaatar Kielanobaatar Proalbionbaatar Cimolodonta see below↓
Cimolodonta Cimolodonta Allocodon Ameribaatar Boffius Corriebaatar Fractinus Halodon Uzbekbaatar Viridomys Gondwanatheria? Paracimexomys group Bryceomys Cedaromys Cimexomys Dakotamys Paracimexomys Cimolomyidae Buginbaatar Cimolomys Essonodon Meniscoessus Paressodon Parikimys Kogaionidae Barbatodon Hainina Kogaionon Litovoi Eucosmodontidae Clemensodon Eucosmodon Stygimys Microcosmodontidae Acheronodon Microcosmodon Pentacosmodon Ptilodontoidea Filikomys Neoliotomus Cimolodontidae Anconodon Cimolodon Liotomus Neoplagiaulacidae Cernaysia Ectypodus Krauseia Mesodma Mesodmops Mimetodon Neoplagiaulax Nidimys 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 Kryptobaatar Mangasbaatar Tombaatar
See also: Plagiaulacida Category

• Ptilodontoids
• Paleocene genus extinctions
• Cretaceous mammals of North America
• Paleocene mammals of North America
• Ojo Alamo Formation
• Milk River Formation
• Hell Creek fauna
• Prehistoric mammal genera