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Hatt's vesper rat
Conservation status
Least Concern  (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Family:	Cricetidae
Genus:	Otonyctomys Anthony, 1932
Species:	O. hatti
Binomial name
Otonyctomys hatti Anthony, 1932

Hatt's vesper rat (Otonyctomys hatti), also known as Hatt's vesper mouse or Yucatán vesper rat, is a species of rodent in the family Cricetidae. It is the only species in the genus Otonyctomys. It is named for its discoverer, Robert T. Hatt.

Description

Hatt's vesper rat has a typical rat-like appearance, and closely resembles the related Sumichrast's vesper rat, from which it can most easily be distinguished by its much larger auditory bullae. It is relatively small for a rat, both sexes having a head body length of 9 to 12 centimetres (3.5 to 4.7 in), and a long, 6 to 13 centimetres (2.4 to 5.1 in), tail. Adults weigh from 23 to 36 grams (0.81 to 1.27 oz).

The rat is brightly coloured, with bright russet or yellowish fur over most of the body, and creamy or white underparts. The face has a short, rounded snout, and conspicuous black markings in front of the eyes, stretching as far as the whiskers. Younger individuals tend to be duller in colour, and have less glossy fur than the adults. The tail is thickly covered with brown fur along its entire length, although the ears are largely hairless. Females have four abdominal teats.

Distribution and habitat

Hatt's vesper rat is found throughout the Yucatán Peninsula, in the Mexican states of Campeche, Yucatán, and Quintana Roo, and in northern Guatemala and Belize. It inhabits broadleaf tropical forests close to water and below about 250 metres (820 ft) elevation. It has generally been recorded in trees or lianas, on fallen wood, or even in the rafters of houses, and may be largely arboreal in its habits.

Biology

The rat is little studied, and, as of 2008, was known only from eighteen specimens. It appears to be nocturnal, and herbivorous, eating seeds and fruit, and to spend much of its time in the trees. The breeding season, if it has a specific one, is unknown, although one specimen caught in February was a lactating female. It is listed as a threatened species in Mexico, but is considered of least concern by the IUCN because of its apparently wide distribution and adaptability. Fossil specimens have been discovered dating back to the Pleistocene.

References

1. ^ Timm, R.; Reid, F.; Woodman, N.; McCarthy, T.; Matson, J. (2017) . "Otonyctomys hatti". IUCN Red List of Threatened Species. 2016: e.T15664A115129163. doi:10.2305/IUCN.UK.2016-3.RLTS.T15664A22344967.en. Retrieved 12 March 2022.
2. "Mammal Diversity Database". mammaldiversity.org. American Society of Mammalologists. 2019. Retrieved 6 January 2019.
3. Musser, G. G.; Carleton, M. D. (2005). "Superfamily Muroidea". In Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 894–1531. ISBN 978-0-8018-8221-0. OCLC 62265494.
4. ^ MacSwiney, M.C.; et al. (2009). "Otonyctomys hatti (Rodentia: Cricetidae)". Mammalian Species. 825: 1–5. doi:10.1644/825.1.
5. SecretarÍa de Medio Ambiente & Recursos Naturales. "Protección ambiental—especies nativas de México de flora y fauna silvestres—categoría de riesgo y especificaciones para su inclusión, exclusión o cambio—lista de especies en riesgo" (PDF). Archived from the original (PDF) on 28 September 2011. Retrieved 9 July 2011.

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

• IUCN Red List least concern species
• Mammals described in 1932
• Rodents of Central America
• Tylomyinae