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Scolomys ucayalensis
Conservation status
Least Concern  (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Family:	Cricetidae
Subfamily:	Sigmodontinae
Genus:	Scolomys
Species:	S. ucayalensis
Binomial name
Scolomys ucayalensis Pacheco, 1991
Synonyms
Scolomys juruaense Patton and da Silva, 1995

Scolomys ucayalensis, also known as the long-nosed scolomys or Ucayali spiny mouse is a nocturnal rodent species from South America. It is part of the genus Scolomys within the tribe Oryzomyini. It is found in Brazil, Colombia, Ecuador and Peru in various different habitats in the Amazon rainforest.

Description

Scolomys ucayalensis has a head-and-body length of between 80 and 90 mm (3.1 and 3.5 in) and a tail around 83% of this. The head is small but broad with a pointed snout and small rounded ears. The fur is a mixture of fine hairs and thicker, flattened spines. The dorsal surface is some shade of reddish-brown to reddish-black, sometimes grizzled or streaked with black, and the underparts are grey. The tail is nearly naked, and the hind feet are small but broad. The hypothenar pad (next to the outer digit on the sole of the foot) is either absent or reduced in size on the hind feet, and this contrasts with the otherwise similar Scolomys melanops which has well-developed hypothenar pads. The karyotype of S. ucayalensis has 2n = 50 and FN = 68, while that of S. melanops has 2n = 60, FN = 78.

Distribution and habitat

S. ucayalensis is found on the eastern side of the Andes in South America. Its range extends from southern Colombia and southern Ecuador, through western Brazil to northern Peru, and completely surrounds the range of S. melanops. Its habitat varies, with specimens being found in primary terra firme (non-flooded) lowland humid forest in Brazil, in undergrowth growing where primary forest had been cut back, and in cloud forest where the trees are clad in mosses and bromeliads. Its altitudinal range is between 200 and 1,400 m (660 and 4,590 ft).

References

1. ^ Anderson et al., 2008
2. Musser and Carleton, 2005
3. ^ Patton, James L.; Pardiñas, Ulyses F.J.; D'Elía, Guillermo (2015). Mammals of South America, Volume 2: Rodents. University of Chicago Press. pp. 445–448. ISBN 978-0-226-16957-6. OCLC 904333770.

Literature cited

• Anderson, R.P.; Gómez-Laverde, M.; Tirira, D. (2008). "Scolomys ucayalensis". IUCN Red List of Threatened Species. 2008: e.T20037A9138161. doi:10.2305/IUCN.UK.2008.RLTS.T20037A9138161.en. Retrieved 26 April 2023.
• 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. p. 1173. ISBN 978-0-8018-8221-0. OCLC 62265494.

• IUCN Red List least concern species
• Scolomys
• Mammals described in 1991