San Juan Comb rat

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San Juan 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 : San Juan Comb rat
Scientific name
Ctenomys johannis
Thomas , 1921

The San Juan crested rat ( Ctenomys johannis ) is a species of crested rats . The species occurs in western Argentina , where it is only found in the province of San Juan .

features

The San Juan comb rat reaches a head-trunk length of 19.9 centimeters and a tail length of 9.7 centimeters; Information on weight is not available. The rear foot length is 36 millimeters. All information comes from the type of the first description. It is thus a medium-sized species of the genus, which is similar in size to the puntilla comb rat ( Ctenomys coludo ). The back color is dark gray and resembles the color of the Sierra del Tontal comb rat ( Ctenomys tulduco ), compared to the puntilla comb rat, the fur is less sandy. The neck, front back, and sides of the face are gray. The belly side is also gray, the hair tips of the peritoneum are white to slightly sandy-colored. The tail is short and also gray.

The skull corresponds to that of the puntilla comb-rat and the Sierra-del-Tontal-comb rat, but compared to the latter it is slightly larger. The width of the zygomatic arches is wider than that of the ear openings.

distribution

The distribution area of ​​the San Juan comb rat is limited to western Argentina , where it has only been proven to be endemic from its first place of discovery in the province of San Juan . The altitude distribution is around 600 meters.

Way of life

There is very little information available about the way of life of the San Juan crested rat, as is the case with most species of crested rats. Like all comb rats, it lives largely underground in duct systems. The animals eat vegetarian food on the available plants, especially grass and leaves, and are solitary. According to the collector, the type was caught in the area of ​​the passage openings on sandy soil under trees.

Systematics

The San Juan 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 British zoologist Oldfield Thomas from 1921, who described it as a subspecies of the puntilla crested rat ( Ctenomys coludo ) using individuals from Cañada Honda in the province of San Juan in Argentina. Sometimes the species was added to the yellow-brown comb rat ( Ctenomys fulvus ) with others .

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

Status, threat and protection

The International Union for Conservation of Nature and Natural Resources (IUCN) does not classify the San Juan comb rat in a hazard category due to a lack of data, but rather lists it as "data deficient". It is assumed that the species is threatened due to its very small range, but information about the populations and their situation is very limited.

supporting documents

  1. ↑ a b c d e f g h San Juan 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. 532. ISBN 978-84-941892-3-4 .
  2. ↑ a b c Ctenomys johannis in the endangered Red List species the IUCN 2019. Posted by: CJ Bidau, 2016. Retrieved on 10 May 2020th
  3. ↑ a b c Ctenomys johannis . 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

  • San Juan 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. 532. ISBN 978-84-941892-3-4 .

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