Bristle-spined Porcupine: Encyclopedia - Bristle-spined Porcupine

Bristle-spined Porcupine

The Bristle-spined Porcupine, Chaetomys subspinosus, is an arboreal rodent from Brazil. Also known as the Thin-spined Porcupine, it is the only member of the genus Chaetomys and the subfamily Chaetomyinae.

Bristle-spined Porcupine - Characteristics

Bristle-spined Porcupines are named because the spines on the back are more bristle-like in texture than the spines on the rest of the body. They have long naked tails which are not prehensile. Adult animals weigh around 1.3 kg.

Their skulls are unusual in several ways. The eye socket is almost completely surrounded by a ring of bone. Incisors are distinctly narrow. Overall, the animal displays a mix of New World porcupine cranial characters, spiny rat cranial characters, and characters that set it apart from all other rodents.

The Bristle-spined Porcupine is restricted to remnant forests and forest edges in the Atlantic coastal forests on the East Coast of Brazil. Its habitat is dwindling rapidly and the species may be vulnerable to extinction. It is classified as vulnerable by IUCN and endangered by USDI (Nowak, 1999).

Bristle-spined Porcupine - Taxonomic controversy

No consensus has been reached as to the taxonomic position of Chaetomys. It is commonly placed with the New World porcupines in the family Erethizontidae or with the spiny rats the family Echimyidae. Both are South American hystricognaths with hairs modified as spines or quills. Chaetomys has more highly developed spines than the spiny rats, but less developed than the porcupines. Characteristics of the premolar suggest that it belongs with the Echimyidae, but characteristics of the incisor enamel suggest that it belongs in the Erethizontidae.

Patterson and Pascual (1968), Patterson and Wood (1982), Woods (1982, 1984, 1993) Patton and Reig (1989), Nowak (1999), and Carvalho (2000) support the inclusion of this animal in the Echimyidae whereas Martin (1994), McKenna and Bell (1997), and Carvalho and Salles (2004) argue that it belongs in the Erethizontidae. Emmons (2005) mentions the family Chaetomyidae without much further comment except to exclude it from Echimyidae.

Adapted from the Wikipedia article "Bristle-spined Porcupine", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki