Two-tone comb rat
| Two-tone comb rat | ||||||||||||
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| Ctenomys bicolor | ||||||||||||
| Miranda-Ribeiro , 1914 |
The two-colored crested rat ( Ctenomys bicolor ) is a type of crested rat . The species was first scientifically described in 1914 from the southwestern Amazon region of Brazil and is only known from individual finds in the state of Rondônia .
features
The two-tone comb rat reaches a head-torso length of 31.4 centimeters on average and a tail length of 8.9 centimeters. The rear foot length is around 45 millimeters with the claw and 39 millimeters without the claw. It is a medium-sized species of the genus. Two color morphs have been described of the species. The type had a brown back and a lighter colored belly, another individual was completely black.
The karyotype consists of a chromosome set of 2n = 40 chromosomes (FN = 68).
distribution
The two-colored crested rat lives in the southwestern Amazon region of Brazil and is scientifically only known from two individual finds in the state of Rondônia . The type was collected in 1914 in the Indian village of José Bonifácio, another individual comes from Pimenta Bueno . The altitude distribution is around 335 meters above sea level.
Way of life
The habitats of the two-tone crested rat are shaped by the Amazonian rainforest of Mato Grosso . It lives in sandy soils of the forests along rivers and in strips of sand of the southern Amazon basin, although it can also occur in deforested areas in cassava fields . Like all other crested rats, she lives on the ground and digs in the ground. No information is available about their way of life.
Systematics
The two-colored comb rat is classified as an independent species in the genus of comb rats ( Ctenomys ). This consists of about 70 species. The first scientific description of the species comes from the Brazilian zoologist Alípio de Miranda-Ribeiro from 1914, who described it using an individual without specifying the terra typica . The type specimen was collected by the Commisão de Linhas Telegráphicas Estratégicas de Matto-Grosso ao Amazonas (Comissão Rondon) on October 9, 1912, probably by Miranda-Ribeiro as the chief zoologist himself. Subsequent editors specified the “Mato Grosso” as the place of discovery. Bidau & Dias de Avila-Pires 2009 corrected the information and delimited the area on the basis of the records of the Comissão Rondon to the area near the village of José Bonifácio in the state of Rondônia, which only existed since 1981, and entered the coordinates 11 ° 50 '10' 'to 12 ° 00' 00 '' South and 60 ° 51 '35' 'W to 61 ° 19' 29 '' West, stating that the actual range is likely to be smaller.
The species is currently not assigned to any species group in the genus. The taxonomic status and, above all, the differentiation from the Natterer comb rat ( Ctenomys nattereri ) and the Rondônia comb rat ( Ctenomys rondoni ) are unclear. Apart from the nominate form, no further subspecies are distinguished within the species .
Status, threat and protection
The two-tone comb rat is not listed by the International Union for Conservation of Nature and Natural Resources (IUCN) so far (as of May 2019).
supporting documents
- ↑ a b c d e f g h i Bicolored 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. 513. ISBN 978-84-941892-3-4 .
- ↑ a b c Claudio J. Bidau, Fernando Dias de Avila-Pires: On the type locality of Ctenomys bicolor Miranda Ribeiro, 1914 (Rodentia: Ctenomyidae). Mastozoología Neotropical 16 (2), 2009; Pp. 445-447.
literature
- Bicolored 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. 513. ISBN 978-84-941892-3-4 .