Oligoryzomys nigripes

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Oligoryzomys nigripes
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Cricetidae
Subfamily: Sigmodontinae
Genus: Oligoryzomys
Species:
O. nigripes
Binomial name
Oligoryzomys nigripes
(Olfers, 1818)
Synonyms
  • Mus nigripes Olfers, 1818
  • Oryzomys delticola Thomas, 1917
  • Hesperomys eliurus Wagner, 1845
  • Hesperomys pygmaeus Wagner, 1845
  • Mus tarso nigro Fischer, 1814
  • Oryzomys (Oligoryzomys) utiaritensis J.A. Allen, 1916
Oligoryzomys nigripes is found in South America. South america tr.jpg
Oligoryzomys nigripes is found in South America.

Oligoryzomys nigripes, also known as the black-footed colilargo [2] or the black-footed pygmy rice rat, [1] is a rodent in the genus Oligoryzomys of family Cricetidae. Oligoryzomys nigripes is a species that has been further divided into different sister taxa throughout history. It is found in different countries in South America. [3] It is a large species with long ears, dark yellow to dark brown upperparts, sharply delimited from the whitish underparts, and often a pink girdle on the chest. This species of rat spends much of its life among the trees. [4] The karyotype is 2n = 62, FNa = 78–82. [3]

Contents

Synonym species

Two other species, Oligoryzomys delticola (also known as the delta pygmy rice rat [5] or the large colilargo) [2] and Oligoryzomys eliurus (also known as the Brazilian pygmy rice rat [6] or the Brazilian colilargo) [2] have been recognized as synonyms of O. nigripes since 2005; they cannot be distinguished on the basis of morphology, karyotype, or morphometrics.

This is Oligoryzomys longicaudatus, a sister species of Oligoryzomys nigripes that resembles it. Raton colilarga.jpg
This is Oligoryzomys longicaudatus, a sister species of Oligoryzomys nigripes that resembles it.

Location

Oligoryzomys nigripes is found from Pernambuco in northeastern Brazil through the Atlantic Forest and Cerrado into Paraguay, Uruguay, and Argentina, where it occurs in the provinces of Chaco, Misiones, and Buenos Aires. [3]

Morphology

The pelage colors for this species resemble brown, dark yellow, and grey. [7] This species of Oligoryzomys have small bodies and long tails. [4] The totaled head plus body length of the model species for O. nigripes is 9 cm. [8] The tail length for the model species for O. nigripes is 10.5 cm. [8] The weight of the animal ranges from 26.32 grams to 33.3 grams. [8] The eyes of this species are rounded and jet black.

Behavior

Oligoryzomys nigripes is a nocturnal species of rodent. [4] They live entirely on land and many of them dwell in the trees. [4] They are proficient at climbing these trees. [9] This species is a known insectivore, but can be frugivorous. Therefore, O. nigripes is considered an omnivore. [9] They scavenge for nutrient sources in things such as fruits, insects, and seeds. [4]

Karyotype

There are 31 pairs of chromosomes found in the Oligoryzomys nigripes species. [10] The diploid formula for this species is 2n=62. [10] There are 60 autosomal chromosomes and 2 sex chromosomes found in this species. [10]

Related Research Articles

Cerradomys marinhus, also known as Marinho's rice rat, is a rodent species from South America. It is found in Minas Gerais, Brazil. It was formerly known as Oryzomys marinhus, but was transferred to the new genus Cerradomys in 2006.

<i>Euryoryzomys russatus</i> Species of mammal (rodent)

Euryoryzomys russatus, also known as the russet oryzomys, russet rice rat, or big-headed rice rat, is a species of rodent in the family Cricetidae. It is a member of the genus Euryoryzomys, which was split off from Oryzomys in 2006. It was first described by Johann Andreas Wagner in 1848. It is found in southern Brazil, eastern Paraguay and northeastern Argentina. It is considered a large species in its genus, with a reddish-brown coat, long tail length, and large skull. It is a terrestrial rodent, spending its time foraging for seeds, fruits, and insects. It is listed by the IUCN as least concern, although studies have shown it to be influenced by anthropogenic disturbances. Predators consist of small members of the order Carnivora.

Oligoryzomys chacoensis, also known as the Chacoan colilargo or Chacoan pygmy rice rat, is a rodent species from South America. It is found in the Gran Chaco region of southeastern Bolivia, southwestern Brazil, Paraguay, and northeastern Argentina. Its karyotype has 2n = 58 and FNa = 74.

<i>Oligoryzomys flavescens</i> Species of rodent

Oligoryzomys flavescens, also known as the flavescent colilargo or yellow pygmy rice rat is a species of rodent in the genus Oligoryzomys of family Cricetidae. It is found in southern South America, occurring in southern Brazil, Paraguay, Uruguay, and northeastern Argentina. Its karyotype has 2n = 64-66 and FNa = 66–70.

<i>Oligoryzomys fulvescens</i> Species of rodent

Oligoryzomys fulvescens, also known as the fulvous colilargo, fulvous pygmy rice rat, or northern pygmy rice rat, is a species of rodent in the genus Oligoryzomys of family Cricetidae. It is found from southern Mexico through Central America into South America, where it occurs south into Peru and Brazil, and includes numerous synonyms, including the type species of the genus, Oryzomys navus Bangs, 1899. The taxonomy of this species is unresolved, and it may be found to contain more than one species. Its karyotype has 2n = 54-60 and FNa = 68–74.

Oligoryzomys microtis, also known as the small-eared colilargo or small-eared pygmy rice rat, is a species of rodent in the genus Oligoryzomys of family Cricetidae. It is found in western Brazil, eastern Peru, Bolivia, and northern Paraguay.

Oligoryzomys stramineus, also known as the straw-colored colilargo or straw-colored pygmy rice rat, is a species of rodent in the genus Oligoryzomys of the family Cricetidae. It occurs only in the cerrado and caatinga ecoregions of northeastern Brazil. Its karyotype has 2n = 52 and FNa = 68-70.

The Tocantins vesper mouse is a South American rodent species of the family Cricetidae. It is found in Brazil. Its karyotype has 2n = 46 and FNa = 66.

<i>Pseudoryzomys</i> Genus of rodent from South America with one species

Pseudoryzomys simplex, also known as the Brazilian false rice rat or false oryzomys, is a species of rodent in the family Cricetidae from south-central South America. It is found in lowland palm savanna and thorn scrub habitats. It is a medium-sized species, weighing about 50 grams (1.8 oz), with gray–brown fur, long and narrow hindfeet, and a tail that is about as long as the head and body. The IUCN has assessed its conservation status as being of least concern, although almost nothing is known about its diet or reproduction.

<i>Oligoryzomys</i> Genus of rodents

Oligoryzomys is a genus of rodents in the tribe Oryzomyini of family Cricetidae. Many species are known as pygmy rice rats or colilargos. The genus is found from Mexico to Tierra del Fuego and includes approximately 17 species.

Oligoryzomys andinus, also known as the Andean colilargo or Andean pygmy rice rat, is a species of rodent in genus Oligoryzomys of family Cricetidae. It is found in the Andes of southern Peru and western Bolivia, but may in fact include more than one species. Its karyotype has 2n = 60 and FNa = 70.

Oligoryzomys destructor, also known as Tschudi's colilargo or the destructive pygmy rice rat, is a species of rodent in the genus Oligoryzomys of family Cricetidae. It is found along the eastern Andes from southern Colombia, through Ecuador, Peru, and Bolivia into northern Argentina. Its karyotype has 2n = 60 and FNa = 76.

Oligoryzomys griseolus, also known as the grizzled colilargo or the grayish pygmy rice rat, is a species of rodent in the genus Oligoryzomys of family Cricetidae. It is found in the Andes of Venezuela and nearby Colombia. Its karyotype has 2n = 62 and FNa = 74–76.

<i>Oligoryzomys longicaudatus</i> Species of rodent

Oligoryzomys longicaudatus, also known as the long-tailed colilargo or long-tailed pygmy rice rat, is a species of rodent in the genus Oligoryzomys of the family Cricetidae. It is found in the southern Andes of Chile and Argentina, with an outlying population in eastern Argentina. As a common species with a wide range and a stable population, the International Union for Conservation of Nature has rated this rodent as being of "least concern".

Oligoryzomys magellanicus, also known as the Patagonian colilargo and the Magellanic pygmy rice rat, is a species of rodent in the genus Oligoryzomys of the family Cricetidae. It is found in the southernmost parts of Argentina and Chile, including Tierra del Fuego and other outlying islands. Its karyotype has 2n = 54 and FNa = 66.

Oligoryzomys fornesi, also known as Fornes' colilargo, is a species of rodent in the genus Oligoryzomys of family Cricetidae. It is found from northeastern Brazil via Paraguay into northeastern Argentina. Its karyotype has 2n = 62 and FNa = 64.

Oligoryzomys moojeni is a species of rodent from South America in the genus Oligoryzomys of family Cricetidae. It is known only from central Brazil, where it is found in the cerrado and gallery forests. It is named after twentieth-century Brazilian zoologist João Moojen. Its karyotype has 2n = 70 and FNa = 84.

Oligoryzomys rupestris is a species of rodent in the genus Oligoryzomys of family Cricetidae. It is known only from eastern Brazil, where it has been found in several localities in the campos rupestres montane savanna ecoregion. This is a small Oligoryzomys species with a gray head, a yellow-brown back and gray belly and tail. Of the two karyotypic forms described by Silva & Yonenaga-Yassuda in 1998, species 1 is probably identical to O. rupestris, while the other is closely related. Its karyotype has 2n = 46 and FNa = 52.

<i>Juliomys anoblepas</i> Species of rodent

Juliomys anoblepas is a rodent in the genus Juliomys of the subfamily Sigmodontinae known from a single broken skull. The specimen was collected by Peter Wilhelm Lund in the caves of Lagoa Santa, Minas Gerais, Brazil, in the first half of the 19th century and described by Herluf Winge in 1888 as Calomys anoblepas. The species remained unstudied and its affinities unclear until 2011, when it was recognized as a member of the genus Juliomys, which includes three other species from southern Brazil and nearby Argentina and Paraguay. J. anoblepas is probably a separate extinct species of the genus, which is no longer found at Lagoa Santa.

In mammals, ungual tufts are tufts of hairs at the base of claws of the forefeet and hindfeet. Their presence has been used as a character in cladistic studies of the Cricetidae, a large family of rodents.

References

  1. 1 2 Weksler et al., 2008
  2. 1 2 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. p. 1143. ISBN   978-0-8018-8221-0. OCLC   62265494.
  3. 1 2 3 Weksler, M. & Bonvicino, C.R. 2005. Taxonomy of pygmy rice rats genus Oligoryzomys Bangs, 1900 (Rodentia, Sigmodontinae) of the Brazilian Cerrado, with the description of two new species. Arquivos do Museu Nacional 63(1):119.
  4. 1 2 3 4 5 González-Ittig, Raul E.; Rivera, Paula C.; Levis, Silvana C.; Calderón, Gladys E.; Gardenal, Cristina N. (June 2014). "The molecular phylogenetics of the genus O ligoryzomys (Rodentia: Cricetidae) clarifies rodent host-hantavirus associations: Rodent Host-Hantavirus Genotype Relationships". Zoological Journal of the Linnean Society. 171 (2): 457–474. doi:10.1111/zoj.12133. hdl: 11336/8004 .
  5. ↑ Pardinas and D'Elia, 2008
  6. ↑ Leite, Y. and Patterson, B. 2008. Oligoryzomys nigripes. In IUCN. IUCN Red List of Threatened Species. Version 2009.2.
  7. ↑ AGRELLOS, RODRIGO; BONVICINO, CIBELE R.; ROSA, ELIZABETH SALBÉ T.; MARQUES, APARECIDO A.R.; D’ANDREA, PAULO S.; WEKSLER, MARCELO (2012-03-02). "The taxonomic status of the Castelo dos Sonhos Hantavirus reservoir, Oligoryzomys utiaritensis Allen 1916 (Rodentia: Cricetidae: Sigmodontinae)". Zootaxa. 3220 (1): 1. doi:10.11646/zootaxa.3220.1.1. ISSN   1175-5334. S2CID   88269086.
  8. 1 2 3 Mario, Lara Carolina; Borghesi, Jéssica; G. Hayashi, Rafael; O. Favaron, Phelipe; N. Rodrigues, Marcio; C. Carvalho, Rafael; Miglino, Maria A. (2018-06-04). "Morphology of the Oligoryzomys nigripes respiratory system". Anatomia, Histologia, Embryologia. 47 (4): 364–371. doi:10.1111/ahe.12363. ISSN   0340-2096. PMID   29869399.
  9. 1 2 de França Silveira Ribeiro, Martim; da Rocha, Pedro Luiz Bernardo; Mendes, Lys Angela Favaroni; Perry, Steven Franklin; Oliveira, Elisabeth Spinelli de (August 2004). "Physiological effects of short-term water deprivation in the South American sigmodontine rice rat Oligoryzomys nigripes and water rat Nectomys squamipes within a phylogenetic context". Canadian Journal of Zoology. 82 (8): 1326–1335. doi:10.1139/z04-104. ISSN   0008-4301.
  10. 1 2 3 de Almeida, Eunice Judith Cardoso; Yonenaga-Yassuda, Yatiyo (January 1991). "Pericentric inversions and sex chromosome heteromorphisms inOryzomys nigripes(Rodentia, Cricetidae)". Caryologia. 44 (1): 63–73. doi:10.1080/00087114.1991.10797020. ISSN   0008-7114.
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