D'Orbigny crested rat
| D'Orbigny crested rat | ||||||||||||
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| Ctenomys dorbignyi | ||||||||||||
| Contreras & ANC Contreras , 1984 |
The D'Orbigny crested rat ( Ctenomys dorbignyi ) is a type of crested rat . The species is endemic to the northeast of Argentina in the provinces of Corrientes and Entre Ríos .
features
The D'Orbigny comb rat reaches a head-torso length of 19.0 to 22.4 centimeters and a tail length of 8.6 to 9.9 centimeters with a weight of about 270 to 380 grams, an average of about 330 grams. The rear foot length is 38.7 to 43 millimeters with claw. It is a comparatively large species of the genus. The back color is evenly brown. The belly side is light brown to sand-colored without a collar or other coloring.
The skull is strongly built and elongated with a comparatively large snout region. The upper incisors are slightly protruding ( proodont ). Compared to some other species in the Chaco region, the interocular area and the zygomatic arch width are somewhat narrower and the tympanic sacs are enlarged.
The karyotype consists of a double set of chromosomes of 2n = 70 (FN = 80 to 84) chromosomes. The sperm are symmetrical.
distribution
The distribution area of the D'Orbigny crested rat is limited to the northeast of Argentina , where the species is endemic and has only been recorded in the provinces of Corrientes and Entre Ríos .
Way of life
There is hardly any information about the way of life of the species. Like all crested rats, it lives largely underground in duct systems and feeds on the available vegetation as a vegetarian. As a habitat it uses open sandy areas between forest areas. The population densities are higher in the southern area than in the north, and the population sizes fluctuate depending on the annual rainfall.
The animals are solitary or semi-social with little social ties to related animals and neighbors. The females give birth to litters from one to three young animals; Beyond that, no information is available on reproduction.
Systematics
The D'Orbigny 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 Argentine zoologists Julio Rafael Contreras and ANC Contreras from 1984, who described it using individuals from the Berón de Astrada department in the Corrientes province . Based on molecular biological data, it is assigned to the torquatus group around the collar-comb rat ( Ctenomys torquatus ). Taxonomic uncertainty exists in the delimitation of the Goya comb rat ( Ctenomys perrensi ) and the Roig comb rat ( Ctenomys roigi ) due to the high frequency of hybridizations in both the populations and the species.
Apart from the nominate form, no subspecies are distinguished within the species .
The species was named after the French paleontologist Alcide Dessalines d'Orbigny (1802–1857).
Status, threat and protection
The D'Orbigny comb rat is classified by the International Union for Conservation of Nature and Natural Resources (IUCN) as a type of warning list ("near threatened"). Although the species occurs relatively frequently in its small distribution area with three disjoint sub-populations, its total settlement area is estimated at less than 500 km². There is no information on the development of the population.
In the northern part of the range, the species is considered a pest due to its penetration into agricultural areas and its consumption of vegetable crops. Their caves also pose a threat to domestic horses in the region, which is why they are hunted as part of pest control .
supporting documents
- ↑ a b c d e f g h i j k D'Orbigny's Tuco-tuco. In: TRO Freitas: Family Ctenomyidae In: Don E. Wilson, TE Lacher, Jr., Russell A. Mittermeier (Eds.): Handbook of the Mammals of the World: Lagomorphs and Rodents 1. (HMW, Volume 6) Lynx Edicions , Barcelona 2016, p. 521. ISBN 978-84-941892-3-4 .
- ↑ Carina F. Argüelles, Pablo Suárez, Mabel D. Giménez, Claudio J. Bidau: Intraspecific chromosome variation between different populations of Ctenomys dorbignyi (Rodentia, Ctenomyidae) from Argentina. Acta Theriologica 46 (4), 2001; Pp. 363-373.
- ↑ a b c Ctenomys dorbignyi . 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 .
- ↑ JR Contreras, ANC Contreras: Diagnosis preliminar de una nueva especie de “anguyá-tutú” (género Ctenomys) para la provincia de Corrientes, Argentina (Mammalia, Rodentia). Historia Natural 4 (13), 1984; Pp. 131-132.
- ↑ a b c Ctenomys dorbignyi in the endangered Red List species the IUCN 2019. Posted by: CJ Bidau, 2016. Accessed April 20, 2020th
literature
- D'Orbigny's Tuco-tuco. In: TRO Freitas: Family Ctenomyidae In: Don E. Wilson, TE Lacher, Jr., Russell A. Mittermeier (Eds.): Handbook of the Mammals of the World: Lagomorphs and Rodents 1. (HMW, Volume 6) Lynx Edicions , Barcelona 2016, p. 521. ISBN 978-84-941892-3-4 .