Octodontidae


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Octodontidae

 

a family of mammals of the order Rodentia. Octodont rodents resemble rats. They have small, bare ears and solid brown coloration. The body length is up to 19.5 cm, and the tail length reaches 18 cm. The teeth, which have no roots, grow constantly.

There are five genera of octodont rodents, embracing eight species. They inhabit the western part of South America, from Argentina to Patagonia, where they are encountered in coastal regions and in mountainous areas with elevations to 3,500 m. The animals are active at twilight and at night. Most species live in burrows of their own construction. The most common species is the degus (Octodont degus), which sometimes damages agricultural crops.

Fossil remains of octodont rodents are known from the Oligocene. Five other genera, including Myocaster, which are separated by some zoologists into the family Capromyidae, are sometimes assigned to the family Octodontidae.

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To date, a total of 24 species of Trichuris have been described from 10 families of rodents in America, Caviidae (1 species), Cricetidae (8), Ctenomyidae (4), Dasyproctidae (1), Echymyidae (1), Geomyidae (1), Heteromyidae (3), Myocastoridae (1), Octodontidae (1), and Sciuridae (3).
bradleyi Babero, Octodon degus Octodontidae Cattan and Cabello, 1975 T.
Five families were united in Octodontoidea, with Abrocomidae (chinchilla rats) sister to two family dyads: Octodontidae (degus and viscacha rats) + Ctenomyidae (tuco-tucos) and Echimyidae (spiny rats, tree rats, and the nutria) + Capromyidae (hutias).
Un nuevo Octodontidae (Rodentia, Caviomorpha) de la Formacion Epecuen (Plioceno medio) de Hidalgo (Provincia de La Pampa).
SISTEMATICA, FILOGENIA E HISTORIA EVOLUTIVA DE ROEDORES OCTODONTOIDEA (CAVIOMORPHA, HYSTRICOGNATHI) DEL OLIGOCENO TARDIO-MIOCENO MEDIO VINCULADOS AL ORIGEN DE LA FAMILIA OCTODONTIDAE
Para cumplir con este objetivo, se reviso la sistematica de todos aquellos octodontoideos conocidos para el lapso temporal Oligoceno tardio-Mioceno medio que han sido interpretados por distintos autores como relacionados al origen de los Octodontidae modernos.
Tan solo nueve especies de roedores neotropicales han sido reportadas presentando autotomia caudal (Muridae [1 especie], Heteromyidae [1], Octodontidae [1], Echimyidae [2], Capromyidae [3] y Chinchillidae [1], ver Shargal et al.