The Rodents (Rodentia) - Order
(Anomaluromorpha) - suborder
The Scaly-Tailed Flying Squirrels & Flying Mice
(Anomaluridae)
- family

(Parapedetidae)
- family -extinct-
The Springhares
(Pedetidae)
- family
(Castorimorpha) - suborder
(Castoroidea) - superfamily

(Eutypomyidae)
- family -extinct-
The Beavers
(Castoridae)
- family

(Rhizospalacidae)
- family -extinct-
(Geomorpha) - infraorder
(Eomyoidea) - superfamily

(Eomyidae)
- family -extinct-
(Geomyoidea) - superfamily

(Heliscomyidae)
- family -extinct-

(Florentiamyidae)
- family -extinct-

(Entoptychidae)
- family -extinct-
The Pocket Gophers
(Geomyidae)
- family
The Kangaroo Rats & Mice
(Heteromyidae)
- family
(Hystricomorpha) - suborder
(Ctenodactyloidea) - superfamily
The Gundis
(Ctenodactylidae)
- family

(Tammquammyidae)
- family -extinct-
The Laotian Rock Rat
(Diatomyidae)
- family

(Yuomyidae)
- family -extinct-

(Chapattimyidae)
- family -extinct-
(Hystricognathiformes) -

(Baluchimyinae)
- subfamily -extinct-
True Hystricognaths (Hystricognathi) - infraorder
Old World Porcupines
(Hystricidae)
- family
(Phiomorpha) - superfamily
The Mole-Rats
(Bathyergidae)
- family

(Thryonomyidae)
- family
New World Hystricognaths (Caviomorpha) -
(Erethizontoidea) - superfamily
New World Porcupines
(Erethizontidae)
- family
(Cavioidea) - superfamily

(Cephalomyidae)
- family -extinct-
The Agoutis & Acouchis
(Dasyproctidae)
- family
The Pacas
(Cuniculidae)
- family

(Eocardiidae)
- family -extinct-
The Pacarana
(Dinomyidae)
- family
The Cavies, Capybaras, & Guinea Pigs
(Caviidae)
- family
(Octodontoidea) - superfamily
The Degus & relatives
(Octodontidae)
- family
Tuco-Tucos
(Ctenomyidae)
- family
spiny rats
(Echimyidae)
- family
The Nutria
(Myocastoridae)
- family
The Hutias
(Capromyidae)
- family
The Giant Hutias
(Heptaxodontidae)
- family -extinct-
(Chinchilloidea) - superfamily
The Chinchillas & Viscachas
(Chinchillidae)
- family

(Neoepiblemidae)
- family -extinct-
The Chinchilla Rats
(Abrocomidae)
- family
(Myomorpha) - suborder
(Muroidea) - superfamily
The Spiny Dormice & Chinese Pygmy Dormice
(Platacanthomyidae)
- family
The Blind Mole-Rats & Bamboo Rats
(Spalacidae)
- family
The Mouse-Like Hamsters
(Calomyscidae)
- family
The Malagasy Mice & Rats, & the African Climbing Mice
(Nesomyidae)
- family
The True Hamsters, Voles & Lemmings
(Cricetidae)
- family
The True Rats, True Mice & Gerbils
(Muridae)
- family
(Dipodoidea) - superfamily
The Jerboas & Jumping Mice
(Dipodidae)
- family
The Squirrel-Like Rodents (Sciuromorpha) - suborder
The Gliders
(Gliridae)
- family
The Squirrels
(Sciuridae)
- family

(Mylagaulidae)
- family