Corrientes Comb rat

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Corrientes Comb rat
Systematics
Subordination : Porcupine relatives (Hystricomorpha)
Partial order : Hystricognathi
without rank: Guinea Pig Relatives (Caviomorpha)
Family : Comb rats (Ctenomyidae)
Genre : Comb rats ( Ctenomys )
Type : Corrientes Comb rat
Scientific name
Ctenomys perrensi
Thomas , 1896

The Corrientes or Goya crested rat ( Ctenomys perrensi ) is a type of crested rat . The species is endemic to the northeast of Argentina , where it is only found in the province of Corrientes .

features

The Corrientes comb rat reaches a total length of 23.0 to 27.0 centimeters, information on the weight of the animals is not available. It is a medium-sized species of the genus. The color is dark sand-brown to clay-colored, with a dark stripe with brown and black hair extending across the center line of the head and back. The underside of the head and the side of the abdomen are lighter in color, and the tops of the front and rear feet are covered with thin white hair.

The skull is comparatively short and broadly rounded, there are only a few small crests. The interocular area is wide and not very high, the postorbital processes are reduced. The upper incisors protrude slightly into the oral cavity ( opisthodont ).

The karyotype consists of a double set of chromosomes of 2n = 50, 54, 56 or 58 chromosomes. The sperm are symmetrical.

distribution

The distribution area of ​​the Corrientes crested rat is limited to the northeast of Argentina , where the species is only found endemic in the province of Corrientes .

Way of life

As is the case with most species of comb rats, very little information is available about the way of life of the Corrientes comb rat. Like all comb rats, it lives largely underground in duct systems. It uses sandy soils as a habitat and feeds itself on a generalist vegetarian basis on the available plants, especially grass and leaves.

The animals are loners (solitary). The females give birth to litters of two to four young animals; beyond that, no information is available about reproduction and development.

Systematics

The Corrientes comb rat is classified as an independent species within the genus of the comb rats ( Ctenomys ), which consists of about 70 species. The first scientific description of the species comes from the British zoologist Oldfield Thomas from 1896, who described it on the basis of individuals from Goya in the province of Corrientes in Argentina. Based on molecular biological data, it is assigned to the torquatus group around the collar-comb rat ( Ctenomys torquatus ).

Apart from the nominate form, no subspecies are distinguished within the species .

Status, threat and protection

The Corrientes comb rat is listed by the International Union for Conservation of Nature and Natural Resources (IUCN) as not endangered (“least concern”). The reasons given are the tolerance of the stocks to habitat changes, the presumed large population and the likely low population decline. It is assumed that the animals belong to two isolated populations . They are not uncommon in their area of ​​distribution.

supporting documents

  1. ↑ a b c d e f g h i j k Perrens’s Tuco-tuco. In: TRO Freitas: Family Ctenomyidae In: Don E. Wilson, TE Lacher, Jr., Russell A. Mittermeier (editor): Handbook of the Mammals of the World: Lagomorphs and Rodents 1. (HMW, Volume 6) Lynx Edicions, Barcelona 2016, p. 522. ISBN 978-84-941892-3-4 .
  2. ↑ a b c d Ctenomys perrensi in the endangered Red List species the IUCN 2019. Posted by: CJ Bidau, 2019. Accessed April 30, 2020th
  3. ↑ a b Ctenomys perrensi . In: Don E. Wilson , DeeAnn M. Reeder (Eds.): Mammal Species of the World. A taxonomic and geographic Reference. 2 volumes. 3. Edition. Johns Hopkins University Press, Baltimore MD 2005, ISBN 0-8018-8221-4 .

literature

  • Perrens's tuco-tuco. In: TRO Freitas: Family Ctenomyidae In: Don E. Wilson, TE Lacher, Jr., Russell A. Mittermeier (editor): Handbook of the Mammals of the World: Lagomorphs and Rodents 1. (HMW, Volume 6) Lynx Edicions, Barcelona 2016, p. 522. ISBN 978-84-941892-3-4 .

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