Sciuromorpha

A dormouse is a rodent of the family Gliridae (this family is also variously called Myoxidae or Muscardinidae by different taxonomists). Dormice are nocturnal animals found in Africa, Asia, and Europe. They are named for their long, dormant hibernation period of six months or longer. There are nine genera and 28 living species of dormice, with half of living species belonging to the African genus Graphiurus.

Sciuromorpha ( 'squirrel-like') is a rodent suborder that includes several rodent families. It includes all members of the Sciuridae (the squirrel family) as well as the mountain beaver species.

Ceratogaulus is an extinct genus of rodents, a member of the extinct fossorial (burrowing) rodent family Mylagaulidae. Ceratogaulus is one of two rodent genera with horns (along with fellow mylagaulid Mylagaulus) and is the smallest known horned mammal. Ceratogaulus lived in North America from the late Miocene to the early Pliocene epochs, 16.3 to 5.3 million years ago. Ceratogaulus (and to a lesser extent Mylagaulus) have sometimes been nicknamed "horned gophers", though they are only distantly related to true gophers.

The family Aplodontiidae also known as Aplodontidae, Haplodontiidae or Haploodontini is traditionally classified as the sole extant family of the infraorder Protrogomorpha. It may be the sister family of the Sciuridae. There are fossils from the Oligocene until Miocene in Asia, from Oligocene in Europe and from the Oligocene until the present in North America, where there is the only living species: the mountain beaver (Aplodontia rufa).

The Mylagaulidae or mylagaulids are an extinct clade of sciuromorph rodents nested within the family Aplodontiidae. They are known from the Neogene of North America and China. The oldest member is the Late Oligocene Trilaccogaulus montanensis that lived some 29 million years ago (Mya), and the youngest was Ceratogaulus hatcheri—formerly in the invalid genus "Epigaulus" —which was found barely into the Pliocene, some 5 Mya.

Mylagaulus is an extinct genus of rodents in the family Mylagaulidae. Mylagaulus lived in the Americas during the middle to late Miocene.