Caatinga vesper mouse

The caatinga vesper mouse (Calomys expulsus) (also known as the caatinga laucha[2] or rejected vesper mouse[1]) is a rodent species in the family Cricetidae from South America.[2] It is endemic to eastern Brazil, where it is found in open savanna (cerrado) and thorny scrub (caatinga) habitats.[1] Its karyotype has 2n = 66 and FN = 68. It was formerly synonymized with C. callosus, but the latter has 2n = 50 and FN = 66.[2] Karyologic analysis of C. expulsus has shown that the X chromosome is large and submetacentric while the Y chromosome is either acrocentric or submetacentric.[3] Predators include the barn owl .[4] Sexual dimorphism in shape and size occurs; the former is present mainly before the age of 20 days. Males are smaller before age 50 days and larger thereafter, which becomes less prominent after 200 days.[5]

Caatinga vesper mouse
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Cricetidae
Subfamily: Sigmodontinae
Genus: Calomys
Species:
C. expulsus
Binomial name
Calomys expulsus
(Lund, 1841)

References
  1. Bonvicino, C.R.; Geise, L. (2017) [errata version of 2016 assessment]. "Calomys expulsus". IUCN Red List of Threatened Species. 2016: e.T136689A115211375. Retrieved 24 December 2019.
  2. 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. 1107. ISBN 978-0-8018-8221-0. OCLC 62265494.
  3. Pereira, L. G.; Geise, L. (August 2007). "Karyotype composition of some rodents and marsupials from Chapada Diamantina (Bahia, Brasil)". Brazilian Journal of Biology. 67 (3): 509–518. doi:10.1590/S1519-69842007000300016. ISSN 1519-6984. PMID 18094834.
  4. Magrini, L.; Facure, K. G. (November 2008). "Barn owl (Tyto alba) predation on small mammals and its role in the control of hantavirus natural reservoirs in a periurban area in southeastern Brazil". Brazilian Journal of Biology. 68 (4): 733–740. doi:10.1590/s1519-69842008000400007. PMID 19197490.
  5. Hingst-Zaher, Erika; Marcus, Leslie; Cerqueira, R. (2000-06-25). "Application of geometric morphometrics to the study of postnatal size and shape changes in the skull of Calomys expulsus". Hystrix: The Italian Journal of Mammalogy. 11 (1). doi:10.4404/hystrix-11.1-4139. ISSN 0394-1914.


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