Colburn Comb rat

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Colburn 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 : Colburn Comb rat
Scientific name
Ctenomys colburni
JA Allen , 1903

The Colburn crested rat ( Ctenomys colburni ) is a type of crested rat . The species occurs in the Patagonian steppe in the south of Argentina and has only been found at a few localities in the west of the Río Negro province and in the north of the Santa Cruz province .

features

The Colburn comb rat reaches a head-torso length of about 16.1 centimeters for the males and 14.6 centimeters for the females, the tail length averages 7.1 centimeters for the males and 6.3 centimeters for the females. There is no specific information on weight. It is therefore a small to medium-sized species of comb rats. The back fur is yellowish-gray in color and has black and red-brown washings. The coloration can vary, with many individuals a dark stripe of varying intensity is formed on the upper side of the tail. The ventral side is white.

The karyotype consists of a double chromosome set of 2n = 50 chromosomes, the number of chromosome arms (FN, fundamentally number) is 70. Alternatively, a chromosome number of 2n = 34 is indicated (FN = 64). The sperm are built slightly asymmetrically.

distribution

The distribution area of ​​the Colburn crested rat is in the south of Argentina , where it is proven in the west of the province of Río Negro and in the north of the province of Santa Cruz . The altitude distribution is around 1000 meters.

Way of life

There is little information available about the way of life of the Colburn crested rat, as is the case with most species of crested rats. Like all comb rats, it lives largely underground in duct systems that it creates in the sandy soils of the Chaco steppe . The animals eat vegetarian food from the available grasses and other plants. There is no information about reproduction.

Systematics

The Colburn crested rat is classified as an independent species within the genus of crested rats ( Ctenomys ), which consists of about 70 species. The first scientific description of the species comes from the American zoologist Joel Asaph Allen in 1903, who described it using individuals from "Arroyo Ayke about 50 miles southeast of Lake Buenos Ayres". Based on molecular biological data, the species is assigned to the magellanicus species group around the magellanic comb rat ( Ctenomys magellanicus ) with other related species .

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

Status, threat and protection

The International Union for Conservation of Nature and Natural Resources (IUCN) does not assign the Colburn Comb rat to any hazard category, but rather lists it as "data deficient" due to a lack of data. The species is believed to be endangered, but very little information is available about its occurrence, condition and ecological needs.

supporting documents

  1. ↑ a b c d e f g h i j White-bellied 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. 525, ISBN 978-84-941892-3-4 .
  2. ↑ a b Ctenomys colburni . 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 .
  3. ↑ Ctenomys colburni in the endangered Red List species the IUCN 2020 Posted by: CJ Bidau, 2016. Accessed June 11, 2020th

literature

  • White-bellied 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. 525, ISBN 978-84-941892-3-4 .

Web links