Echimyidae

Spiny rats Temporal range: Late Oligocene - Recent
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Suborder:	Hystricomorpha
Infraorder:	Hystricognathi
Parvorder:	Caviomorpha
Family:	Echimyidae Gray, 1825
Genera
†Cercomys †Maruchito †Paulacoutomys †Willidewu †Adelphomys †Deseadomys †Paradelphomys †Stichomys †Xylechimys Dactylomys Kannabateomys Olallamys †Boromys †Brotomys †Heteropsomys †Puertoricomys †Acarechimys †Chasichimys †Eumysops Hoplomys Lonchothrix Mesomys †Palaeoechimys †Pampamys †Pattersomys †Protacaremys †Protadelphomys †Sallamys Proechimys Thrichomys Trinomys Carterodon Clyomys Euryzygomatomys Callistomys Diplomys Echimys Isothrix Makalata Pattonomys Phyllomys Santamartamys

The spiny rats are a group of hystricognath rodents in the family Echimyidae. They are distributed from central Central America through much of South America. They were also found in the West Indies until the 1800s. Some authorities consider the nutria from southern and central South America to be a part of this family.

Characteristics

In general form, most spiny rats resemble rats, although they are more closely related to guinea pigs and chinchillas. Most species have stiff pointed hairs, or spines, that allow for protection.

Many echimyids can break off their tails when attacked. This action confuses predators long enough for the animal to escape. Unlike lizards, however, the tail of spiny rats does not regenerate. This technique can obviously be used only once in each individual's lifetime.

Most spiny rats are snizzly,meaning that they gribble. Terrestrial, arboreal, and fossorial members of this family exist. In general, the arboreal forms are most rat-like in appearance, whilst the burrowing species are more gopher-like, with stocky bodies and short tails. Most species do not do well in conditions of high heat and aridity and are restricted to regions with an abundant source of water. They are almost exclusively herbivorous.

The Thin-spined Porcupine, Chaetomys subspinosus, is often included in the Echimyidae due to similarities in the premolar.

The spiny rat is the best of all the rats,being the most dirty and snivvly.

Genera

• Family Echimyidae - spiny rats
  • †Cercomys
  • †Maruchito
  • †Paulacoutomys
  • †Willidewu
  • Subfamily †Adelphomyinae
    • †Adelphomys
    • †Deseadomys
    • †Paradelphomys
    • †Stichomys
    • †Xylechimys
  • Subfamily Dactylomyinae
    • Dactylomys - coro-coros
    • Kannabateomys - Rato de Taquara
    • Olallamys
  • Subfamily †Heteropsomyinae - extinct West Indian echimyids
    • †Boromys
    • †Brotomys
    • †Heteropsomys
    • †Puertoricomys
  • Subfamily Eumysopinae
    • †Acarechimys
    • †Chasichimys
    • †Eumysops
    • Hoplomys Armored rat
    • Lonchothrix
    • Mesomys
    • †Palaeoechimys
    • †Pampamys
    • †Pattersomys
    • †Protacaremys
    • †Protadelphomys
    • †Sallamys
    • Proechimys - spiny rats
    • Thrichomys - Punaré
    • Trinomys
    • Tribe Euryzygomatomyini
      • Carterodon
      • Clyomys
      • Euryzygomatomys - Guiara
  • Subfamily Echimyinae
    • Callistomys
    • Diplomys
    • Echimys - arboreal spiny rats
    • Isothrix - toros
    • Makalata
    • Pattonomys
    • Phyllomys
    • Santamartamys

References

• Emmons, L.H. 2005. A Revision of the Genera of Arboreal Echimyidae (Rodentia: Echimyidae, Echimyinae), With Descriptions of Two New Genera. Pp. 247-310 in Lacey, E.A. & Myers, P. 2005. Mammalian Diversification: From Chromosomes to Phylogeography (A Celebration of the Career of James L. Patton). University of California Publications in Zoology.
• Nowak, R. M. 1999. Walker's Mammals of the World, Vol. 2. Johns Hopkins University Press, London.