Hatt's vesper rat

Hatt's vesper rat (Otonyctomys hatti), also known as Hatt's vesper mouse[2] or Yucatán vesper rat,[3] 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.[4]

Hatt's vesper rat

Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Cricetidae
Genus: Otonyctomys
Anthony, 1932
Species:
O. hatti
Binomial name
Otonyctomys hatti
Anthony, 1932

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).[4]

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.[4]

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.[1] 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.[4]

Biology

The rat is little studied, and, as of 2008, was known only from eighteen specimens.[1] 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,[5] but is considered of least concern by the IUCN because of its apparently wide distribution and adaptability.[1] Fossil specimens have been discovered dating back to the Pleistocene.[4]

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References
  1. Timm, R.; Reid, F.; Woodman, N.; McCarthy, T. & Matson, J. (2008). "Otonyctomys hatti". IUCN Red List of Threatened Species. 2008. Retrieved 9 July 2009.CS1 maint: ref=harv (link)
  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.
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