Big-footed dwarf pouch rat
| Big-footed dwarf pouch rat | ||||||||||||
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| Marmosa macrotarsus | ||||||||||||
| ( Wagner , 1842) |
The large- footed pygmy sacred rat ( Marmosa macrotarsus ) is a species of marsupial that occurs in the Amazon basin south of the Amazon and west of the Rio Tapajós .
description
The animals reach a head trunk length of 10.4 to 13.6 cm, have a 14.8 to 20.6 cm long tail and reach a weight of 23 to 51 g. The tail is thus on average about 45% longer than the head and torso combined. The back fur is gray-brown with orange-brown sprinkles. The sides of the body and the top of the head are lighter. There are black circles around the black eyes that do not reach the bases of the ears. The fur on the underside is yellowish or cream-colored to whitish. The paws are whitish or orange in color. The 10% of the tail, which is close to the body, is hairy, the rest is hairless. The bare tail section is brown and the underside is usually lighter than the top. The distant third of the tail is sometimes unpigmented. Females do not have a pouch. The number of teats is eleven, five on each side and one in the middle. The karyotype consists of a chromosome set of 2n = 14 chromosomes (FN = 24).
Habitat and way of life
The big-footed pygmy bag rat lives at heights of 25 to 1900 meters in Terra Firme forests and in the transition area between Terra Firme forest and Igapó forest . Little is known about their behavior, their diet, their activity patterns and their reproduction. In the Brazilian Amazon basin, the animals have so far only been caught on the ground, in the Peruvian part of their range also in the branches of small trees and bushes.
Systematics
The large-footed dwarf bag rat was scientifically described for the first time in 1842 by the German zoologist Johann Andreas Wagner under the name Didelphis macrotarsus . Later it was assigned as a subspecies of the mouse-dwarf pouch rat ( Marmosa murina ). In 2014, in the course of a revision of the genus Marmosa, it was granted the status of an independent species again. Populations of pygmy pouch rats in Bolivia, originally named Marmosa quichua , are provisionally added to Marmosa macrotarsus . In cladograms of the genus Marmosa , they form the sister group of Marmosa macrotarsus Sensu stricto .
status
The IUCN has not yet recorded the large-footed dwarf pouch rat separately, as it was considered a subspecies of the mouse dwarf pouch rat for a long time and only became an independent species again in 2014.
supporting documents
- ↑ a b c d e Diego Astúa: Family Didelphidae (Opossums). in Don E. Wilson , Russell A. Mittermeier : Handbook of the Mammals of the World - Volume 5. Monotremes and Marsupials. Lynx Editions, 2015, ISBN 978-84-96553-99-6 . Page 138.
- ^ Voss, RS; Gutiérrez, EE; Solari, S .; Rossi, RV; Jansa, SA: Phylogenetic Relationships of Mouse Opossums (Didelphidae, Marmosa) with a Revised Subgeneric Classification and Notes on Sympatric Diversity. American Museum Novitates, No. 3817, 2014, SS 1–27 ( PDF )