Order Rodentia

Suborder Sciurognathi

Infraorder Protrogomorpha (=Aplodontomorpha)

Fam. Aplodontidae (Mountain beaver, 1 genus, 1 sp.)

Infraorder Sciuromorpha

Fam. Sciuridae (Squirrels; 50 genera, 273 sp.)

Fam. Castoridae (Beavers, 1 genus, 2 sp.)

Fam. Geomyidae (Pocket gophers, 5 genera, 35 species)

Fam. Heteromyidae (Kangarooo rats and mice, 6 genera, 59 sp.)

Infraorder Myomorpha

Fam. Dipodidae (Jerboas, jumping mice, Birch mice; 15 genera. 51 sp.)

Fam. Muridae (Mice and rats, 281 genera, 1325 sp.)

(Infraorder Anomaluromorpha)

Fam. Anomaluridae (Scaly tailed flying squirrels, 3 genera, 7 sp.)

(Infraorder Pedetomorpha)

Fam. Pedetidae (Spring Hare, 1 genus, 1 sp.)

(Infraorder Ctenodactylomorpha)

Fam. Ctenodactylidae (Gundis, 4 genera, 5 sp.)

(Infraorder Gliriomorpha)

Fam. Myoxidae (Dormice, 8 genera, 26 sp.)

Suborder Hystricognathi

Infraorder Hystricomorpha or Phiomorpha (Old World Hystricognathi)

Fam. Bathyergidae (Mole rats, 5 genera, 12 sp.)

Fam. Hystricidae (Old World porcupines, 3 genera, 11 sp.)

Fam. Petromuridae (Dassie rats, 1 genus, 1 sp.)

Fam. Thryonomyidae (Cane rats or Grasscutters, 1 genus, 2 sp.)

Infraorder Caviomorpha (New World Hystricognathi)

Fam. Erethizontidae (New World porcupines, 4 genera, 12 sp.)

Fam. Chinchillidae (Chinchillas and Viscachas)

Fam. Dinomyidae (Pacaranas, 1 genus, 1 species)

Fam. Caviidae (Guinea pigs, maras, 5 genera, 14 sp.)

Fam. Hydrochaeridae (Capybara, 1 genus, 1 sp.)

Fam. Dasyproctidae (Agoutis, 2 genera, 13 sp.)

Fam. Agoutidae (Pacas, 1 genus, 1 sp.)

Fam. Ctenomyidae (Tuco tuco, 1 genus, 38 sp.)

Fam. Octodontidae (Degus, 6 genera, 9 sp.)

Fam. Abrocomidae (Chinchilla rats, 1 genus, 2 sp.)

Fam. Echimyidae (Spiny rats, 20 genera, 78 sp.)

Fam. Capromyidae (Hutias, 8 genera, 20 sp.)

Fam. Heptaxodontidae (recently extinct West Indian family)

Fam. Myocastoridae (Nutrias, 1 genus, 1 species)