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Armintomys Temporal range: 50.3–46.2 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Suborder:	Myomorpha
Family:	†Armintomyidae Dawson, Krishtalka, & Stucky, 1990
Genus:	†Armintomys Dawson, Krishtalka, & Stucky, 1990
Species:	†A. tullbergi
Binomial name
†Armintomys tullbergi Dawson, Krishtalka, & Stucky, 1990

Armintomys is an extinct genus of rodent from North America related to jerboas and jumping mice. It is the only genus in the family Armintomyidae. It lived during the early Eocene, and is the oldest known example of a hystricomorphous zygomasseteric dentition. In addition, Armintomys is also the oldest known rodent that had an incisor enamel transition from pauciserial to uniserial. Its remains have only been found in the Wind River Basin in Wyoming, and could be found there during the species' existence on Earth. It was previously assumed that Armintomys belonged to the Dipodoidea family, but has since been understood to have been part of an early radiation of dipodoid rodents, but was not directly ancestral to any later dipodoids, thus it was recategorized into its own family.

References

1. Dawson, Mary R.; Krishtalka, Leonard; Stucky, Richard K. (June 8, 1990). "Revision of the Wind River faunas, early Eocene of central Wyoming. IX - The oldest known hystricomorphous rodent (Mammalia: Rodentia)". Carnegie Museum of Natural History, Annals. 59 (2). NASA. doi:10.5962/p.240768. ISSN 0097-4463. Retrieved 3 March 2021.
2. "Mammal Species of the World - Browse: Dipodidae". www.departments.bucknell.edu. Retrieved 2022-04-13.
3. Dawson, Mary R.; Krishtalka, Leonard; Stucky, Richard K. (1990-06-08). "Revision of the Wind River faunas, early Eocene of central Wyoming. IX - The oldest known hystricomorphous rodent (Mammalia: Rodentia)". Carnegie Museum of Natural History, Annals. 59 (2). doi:10.5962/p.240768. ISSN 0097-4463.
4. Korth, William W. (2013-11-21). The Tertiary Record of Rodents in North America. Springer Science & Business Media. ISBN 978-1-4899-1444-6.

v t e Myomorpha
Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Rodentia
Myomorpha †Anomalomyidae Anomalomys Anomalospalax Prospalax Dipodoidea †Aksyiromys †Banyuesminthus †Elmymys †Primisminthus †Simiacritomys Dipodidae Allactaginae Allactaga Allactodipus Pygeretmus Scarturus Cardiocraniinae Cardiocranius Salpingotulus Salpingotus Dipodinae Dipodini Dipus Eremodipus Jaculus Stylodipus Paradipodini Paradipus Euchoreutinae Euchoreutes †Simimyidae Nonomys Simimys Sminthidae †Allosminthus †Gobiosminthus †Heosminthus †Heterosminthus †Lophocricetus †Macrognathomys †Megasminthus †Miosicista †Paraminthus †Schaubemys †Shamosminthus Sicista †Sinosminthus †Tyrannomys Zapodidae Eozapus †Javazapus Napaeozapus †Pliozapus †Sinozapus †Sminthozapus Zapus Muroidea †Armintomyidae Armintomys Platacanthomyidae †Neocometes Platacanthomys Typhlomys Spalacidae Myospalacinae Eospalax Myospalax †Pliosiphneus Rhizomyinae †Brachyrhizomys Cannomys Rhizomys Tachyoryctes Spalacinae Nannospalax Spalax Eumuroida See below↓
Eumuroida Calomyscidae Calomyscus Cricetidae †Copemys †Eumys †Wilsoneumys Arvicolinae Arvicolini Arvicola †Mimomys Clethrionomyini †Allophaiomys †Altaiomys Alticola †Borsodia Caryomys Clethrionomys Craseomys Eothenomys †Pitymimomys †Prolagurus Dicrostonychini Dicrostonyx †Predicrostonyx Ellobiusini Bramus Ellobius Lagurini Eolagurus Lagurus Lemmini Lemmus Myopus †Plioctomys Synaptomys †Tobienia Microtini Alexandromys Chionomys Hyperacrius Lasiopodomys Lemmiscus Microtus Mictomicrotus Neodon Proedromys Stenocranius Volemys Ondatrini †Cosomys Neofiber †Ogmodontomys Ondatra Pliophenacomyini Arborimus Phenacomys Pliomyini Dinaromys †Pliomys Cricetinae Allocricetulus †Apocricetus Cansumys †Collimys †Cricetinus †Cricetulodon Cricetulus Cricetus Mesocricetus †Neocricetodon Nothocricetulus Phodopus †Rotundomys †Symmetrodontomys Tscherskia Urocricetus †Democricetodontinae Democricetodon Karydomys Spanocricetodon Neotominae †Protorepomys †Tsaphanomys Baiomyini Baiomys Scotinomys Neotomini Hodomys Nelsonia Neotoma Xenomys Ochrotomyini Ochrotomys Reithrodontomyini Habromys Isthmomys Megadontomys Neotomodon Onychomys Osgoodomys Peromyscus Podomys Reithrodontomys Sigmodontinae †Cordimus Juliomys †Megaoryzomys Oryzomyalia Abrotrichini Abrothrix Chlelemys Geoxus Notiomys Akodontini Akodon Bibimys Blarinomys Brucepattersonius Deltamys Juscelinomys Kunsia Lenoxus Necromys Neomicroxus Oxymycterus Podoxymys Scapteromys Thalpomys Thaptomys Ozyzomyini Aegialomys Amphinectomys Cerradomys Drymoreomys Eremoryzomys Euryoryzomys Handleyomys Holochilus Hylaeamys Lundomys †Megalomys Melanomys Microakodontomys Microryzomys Mindomys Neacomys Nectomys Nephelomys Nesoryzomys Noronhomys Oecomys Oligoryzomys Oreoryzomys Oryzomys Pseudoryzomys Scolomys Sigmodontomys Sooretamys Tanyuromys Transandinomys Zygodontomys Phyllotini Andalgalomys Andinomys Auliscomys Calassomys Calomys Chinchillula Eligmodontia Euneomys Galenomys Graomys †Ichthyurodon Irenomys Loxodontomys Neotomys †Olympicomys Phyllotis Punomys Reithrodon Salinomys †Tafimys Tapecomys Thomasomyini Abrawayaomys Aepeomys Chilomys Delomys Phaenomys Rhagomys Rhipidomys Thomasomys Wilfredomys Wiedomyini †Cholomys Wiedomys Sigmodontalia Ichthyomyini Anotomys Chibchanomys Daptomys Ichthyomys Neusticomys Rheomys Sigmodontini †Prosigmodon Sigmodon Tylomyinae Nyctomyini Nyctomys Ototylomys Tylomyini Otonyctomys Tylomys Muridae Deomyinae Acomys Deomys Lophuromys Uranomys Gerbillinae Ammodillus Desmodilliscini Desmodilliscus Pachyuromys Gerbillini Brachiones Dipodillus Gerbillus Meriones Microdillus Psammomys Rhombomys Sekeetamys Gerbillurini Desmodillus Gerbilliscus Gerbillurus Tatera Taterillini Taterillus Leimacomyinae Leimacomys Lophiomyinae Lophiomys Murinae †Alormys †Coryphomys Hadromys †Hoojieromys †Milimonggamys †Rakasamys †Spelaeomys Vernaya Apodemini Apodemus †Rhagamys Tokudaia Arvicanthini Aethomys Arvicanthis †Canariomys Dasymys Dephomys Desmomys Golunda Grammomys Hybomys Lamottemys Lemniscomys †Malpaisomys Micaelamys Mylomys Oenomys †Parapelomys Pelomys Rhabdomys †Saharamys †Saidomys Stochomys Thallomys Thamnomys Typomys Hapalomyini Hapalomys Hydromyini Anisomys Apomys Archboldomys Baiyankamys Brassomys Chiropodomys Chiruromys Chrotomys Coccymys Conilurus Crossomys Haeromys Hydromys Hyomys Leggadina Leporillus Leptomys Lorentzimys Macruromys Mallomys Mastacomys Melomys Mesembriomys Microhydromys Mirzamys Notomys Parahydromys Paraleptomys Paramelomys Pogonomys Protochromys Pseudohydromys Pseudomys Rhynchomys Solomys Soricomys Uromys Xeromys Zyzomys Malacomyini Malacomys Millardini Cremnomys Diomys Madromys Millardia Pithecheir Pithecheirops Murini Mus Otomyini Myotomys Otomys Parotomys Phloeomyini Batomys Carpomys Crateromys Musseromys Phloeomys Praomyini Chingawaemys Colomys Congomys Heimyscus Hylomyscus Mastomys Montemys Myomyscus Nilopegamys Ochromyscus Praomys Serengetimys Stenocephalemys Zelotomys Rattini Abditomys Anonymomys Bandicota Berylmys Bullimus Bunomys Chiromyscus Crunomys Dacnomys Diplothrix Echiothrix Eropeplus Halmaheramys Hyorhinomys Kadarsanomys Komodomys Lenomys Lenothrix Leopoldamys Limnomys Margaretamys Maxomys Melasmothrix Micromys Nesokia Nesoromys Niviventer Papagomys Palawanomys Paruromys Paucidentomys Paulamys Rattus Saxatilomys Sommeromys Srilankamys Sundamys Taeromys Tarsomys Tateomys Tonkinomys Tryphomys Waiomys Vandeleurini Vandeleuria †Pseudocricetodontinae Adelomyarion Cincamyarion Heterocricetodon Latocricetodon Lignitella Kerosinia Oxynocricetodon Pseudocricetodon Nesomyidae Cricetomyinae Beamys Cricetomys Saccostomus Delanymyinae Delanymys Dendromurinae Dendromus Dendroprionomys Malacothrix Megadendromus Prionomys Steatomys Mystromyinae Mystromys Nesomyinae Brachytarsomys Brachyuromys Eliurus Gymnuromys Hypogeomys Macrotarsomys Monticolomys Nesomys Voalavo Petromyscinae Petromyscus

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