Rodentia is an order of placentalmammals. Members of this order are called rodents. The order comprises 2,362 extant species, which are grouped into 513 genera. The largest order of mammals, rodents comprise about 40% of all mammal species worldwide. They are native to all major land masses except for Antarctica, and can be found worldwide. They live in a variety of habitats, particularly forests, grasslands, and shrublands, but also savannas, wetlands, deserts, and rocky areas. Most rodents are small animals with robust bodies, short limbs, and long tails. They range in length from the African pygmy mouse, at 4cm (2in) plus a 2cm (1in) tail, to the capybara, at 134cm (53in) plus a 2cm (1in) tail.
The author citation for the species or genus is given after the scientific name; parentheses around the author citation indicate that this was not the original taxonomic placement. Range maps are provided wherever possible; if a range map is not available, a description of the collective range of species in that genera is provided. Ranges are based on the International Union for Conservation of Nature (IUCN) Red List of Threatened Species unless otherwise noted. All extinct genera or species listed alongside extant species went extinct after 1500 CE, and are indicated by a dagger symbol "†".
Classification
The order Rodentia consists of 2,362 extant species belonging to 513 genera. This does not include hybrid species or extinct prehistoric species. Modern molecular studies indicate that the 511 genera can be grouped into 35 families; these families are divided between 5 named suborders and are grouped in those suborders into named clades, and some of these families are subdivided into named subfamilies. An additional 38 species have been driven extinct since 1500 CE: 8 in the family Capromyidae, 6 in Echimyidae, 11 in Cricetidae, and 13 in Muridae.
Members of the Anomaluridae family are called anomalurids or scaly-tailed squirrels. They eat a variety of vegetation, and some also eat insects. Anomaluridae comprises seven extant species, divided into three genera.
Members of the Pedetidae family are called pedetids or springhares. They eat bulbs and roots, as well as stems and grain. Pedetidae comprises two extant species in a single genus.
Diets: Bulbs and roots, as well as stems and grain
Suborder Castorimorpha
Superfamily Castoroidea
Family Castoridae
Members of the Castoridae family are called castorids or beavers. They eat woody and aquatic plants. Castoridae comprises two extant species in a single genus.
Members of the Geomyidae family are called geomyids, pocket gophers, or gophers. They primarily eat roots, bulbs, and rhizomes, as well as other vegetation. Geomyidae comprises 36 extant species in 7 genera.
Members of the Heteromyidae family are called heteromyids and include kangaroo rats, kangaroo mice, pocket mice, and spiny pocket mice. They primarily eat seeds, leaves, and other vegetation, as well as grain and insects. Heteromyidae comprises 63 extant species in 5 genera. These genera are divided between three subfamilies: Dipodomyinae, containing the kangaroo rats and kangaroo mice; Heteromyinae, or the spiny pocket mice; and Perognathinae, or the pocket mice.
Members of the Caviidae family are called caviids and include guinea pigs, cavies, maras, and capybaras. They are herbivores and eat a wide variety of vegetation, primarily grass and leaves. Caviidae comprises 21 extant species which are divided into 6 genera in 3 subfamilies: Caviinae, containing the guinea pigs and cavies; Dolichotinae, containing the maras; and Hydrochoerinae, containing rock cavies and capybaras.
Members of the Dasyproctidae family are called dasyproctids and include agoutis and acouchis. They are herbivores and primarily eat fruit, vegetables, and succulent plants. Dasyproctidae comprises fifteen extant species which are divided into two genera.
Size range: 30cm (12in) long, plus 4cm (2in) tail (green acouchi) to 39cm (15in) long, plus 8cm (3in) tail (red acouchi)
Habitats: Forest
Diets: Fruit, seeds, vegetables, and succulent plants
Superfamily Chinchilloidea
Family Chinchillidae
Members of the Chinchillidae family are called chinchillids and contain chinchillas and viscachas. They are herbivores and eat grass and seeds, as well as other vegetation. Chinchillidae comprises six extant species which are divided into three genera, as well as a single extinct species.
Members of the Erethizontidae family are called erethizontids or New Worldporcupines. They are herbivores and primarily eat leaves, stems, fruit, flowers, and roots. Erethizontidae comprises eighteen extant species in three genera, grouped into two subfamilies: Chaetomyinae, containing a single species, and Erethizontinae, containing the other seventeen.
Size: 60–130cm (24–51in) long, plus 16–25cm (6–10in) tail
Habitats: Forest, shrubland, and grassland
Diet: Buds, twigs, roots, stems, leaves, flowers, seeds, berries, nuts, and other vegetation
Superfamily Octodontoidea
Family Abrocomidae
Members of the Abrocomidae family are called abrocomids or chinchilla rats. They are herbivores and eat a variety of vegetation. Abrocomidae comprises ten extant species which are divided into two genera.
Members of the Capromyidae family are called capromyids or hutias. They are omnivores and eat leaves, fruit, bark, and small animals. Capromyidae comprises ten extant species in five genera, grouped into two subfamilies: Capromyinae, containing nine species, and Plagiodontinae, containing a single species. Additionally, two species in Capromyinae, three species in Plagiodontinae, the sole species in the subfamily Hexolobodontinae, and the two species in the subfamily Isolobodontinae were driven extinct after 1500 due to the European colonization of the Americas and introduction of non-native rats, with some species surviving until the 1900s.
Members of the Ctenomyidae family are called ctenomyids or tuco-tucos. They are herbivores and eat a wide variety of vegetation. Ctenomyidae comprises 61 extant species in a single genus.
Members of the Echimyidae family are called echimyids or Neotropical spiny rats, and include spiny rats, tree-rats, and cave rats. They primarily eat a wide variety of vegetation, though some species also eat insects. Echimyidae comprises 88 extant species in 23 genera, split into three subfamilies: Caterodontinae, containing a single species; Echimyinae, containing 75 species, and Euryzygomatomyinae, containing 12 species. Additionally, six species of Caribbean cave rat, comprising the three genera of the subfamily Heteropsomyinae, were driven to extinction since 1500 due to the European colonization of the Americas and introduction of non-native rats, with some species surviving until the 1900s.
Members of the Octodontidae family are called octodontids and include degus, rock rats, and viscacha rats. They are herbivores, and eat a variety of plant matter and fruit, with some species also eating dung. Octodontidae comprises fourteen extant species in seven genera.
Size range: 11cm (4in) long, plus 11cm (4in) tail (Kirchner's viscacha rat) to 16cm (6in) long, plus 12cm (5in) tail (Chalchalero viscacha rat)
Habitats: Grassland, shrubland, shrublands, and inland wetlands
Diets: Leaves and stems
Superfamily Ctenodactyloidea
Family Ctenodactylidae
Members of the Ctenodactylidae family are called ctenodactylids or gundis. They eat a variety of vegetation. Ctenodactylidae comprises five extant species in four genera.
Members of the Hystricidae family are called hystricids or Old World porcupines. They are primarily herbivores and eat grasses, bulbs, tubers, fruit, bark, and roots, though insects and carrion are occasionally eaten. Hystricidae comprises eleven extant species in three genera.
Members of the Bathyergidae family are called bathyergids, blesmols, or mole-rats. They are omnivores, and primarily eat roots, bulbs, and tubers, as well as earthworms and insects. Bathyergidae comprises twenty-one extant species in five genera.
Size: 13–22cm (5–9in) long, plus 11–18cm (4–7in) tail
Habitats: Shrubland and rocky areas
Diet: Vegetation, seeds, and berries
Family Thryonomyidae
Members of the Thryonomyidae family are called thryonomyids or cane rats. It contains two species, which eats grass and cane, as well as bark, nuts, and fruit.
Members of the Dipodidae family are called dipodids or jerboas. They are omnivores, and eat a variety of vegetation as well as insects, arachnids, and lizards. Dipodidae comprises 33 extant species in 13 genera, which are divided into 4 subfamilies: Allactaginae contains 16 species, Cardiocraniinae contains 7 species, Dipodinae contains 9, and Euchoreutinae contains a single species.
Members of the Sminthidae family are called sminthids or birch mice. They are omnivores and primarily eat seeds, berries, and insects. Sminthidae comprises sixteen extant species in a single genus.
Size range: 4cm (2in) long, plus 8cm (3in) tail (Caucasian birch mouse) to 8cm (3in) long, plus 11cm (4in) tail (Altai birch mouse)
Habitats: Inland wetlands, shrubland, forest, and grassland
Diets: Seeds, berries, and insects
Family Zapodidae
Members of the Zapodidae family are called zapodids or jumping mice. They are omnivores and eat a variety of vegetation and insects. Zapodidae comprises five extant species in three genera.
Size range: 7cm (3in) long, plus 10cm (4in) tail (meadow jumping mouse) to 11cm (4in) long, plus 16cm (6in) tail (Pacific jumping mouse)
Habitats: Forest, shrubland, grassland, and inland wetlands
Diets: Seeds, as well as fungi, nuts, berries, fruit, and insects
Superfamily Muroidea
Family Calomyscidae
Members of the Calomyscidae family are called calomyscids or brush-tailed mice. They are omnivores and primarily eat seeds, as well as flowers, leaves, and animal matter. Calomyscidae comprises eight extant species in a single genus.
Members of the Cricetidae family are called cricetids and include hamsters, voles, lemmings, muskrats, and New World rats and mice. They eat vegetation, seeds, and insects, and some also eat fungi, fish, and small animals. Cricetidae comprises 694 extant species, the second-most of any mammal family, divided into 143 genera. These genera are divided into five subfamilies: Arvicolinae, containing 158 species of voles, lemmings, and muskrats; Cricetinae, containing 18 species of hamsters; Neotominae, containing 123 species of deer mice, packrats, and grasshopper mice; Sigmodontinae, containing 385 species of New World rats and mice; and Tylomyinae, containing 10 species of vesper and climbing rats. Additionally, one species in Neotominae and ten species in Sigmodontinae were driven extinct after 1500 due to the European colonization of the Americas and introduction of non-native rats, with some species surviving until the 1900s.
Members of the Muridae family are called murids and include gerbils and many types of mice and rats. They eat a variety of vegetation and invertebrates, though some also eat small vertebrates. Muridae comprises 801 extant species, the most of any mammal family, divided into 156 genera. These genera are divided into five subfamilies: Deomyinae, containing 55 species of spiny mice and brush-furred rats; Gerbillinae, containing 102 species of gerbils, jirds, and sand rats; Leimacomyinae, containing a single rat species; Lophiomyinae, containing a single mouse species; and Murinae, containing 642 species of Old World mice and rats. Additionally, thirteen species in Murinae have been driven extinct since 1500.
Size range: 6cm (2in) long, plus 7cm (3in) tail (small Japanese field mouse) to 15cm (6in) long, plus 15cm (6in) tail (western broad-toothed field mouse)
Size range: 16cm (6in) long, plus 15cm (6in) tail (white-bellied Luzon tree rat) to 19cm (7in) long, plus 19cm (7in) tail (short-footed Luzon tree rat)
Size range: 6cm (2in) long, plus 8cm (3in) tail (gray-bellied pencil-tailed tree mouse) to 13cm (5in) long, plus 18cm (7in) tail (Palawan pencil-tailed tree mouse)
Size range: 18cm (7in) long, plus 23cm (9in) tail (central Sulawesi echiothrix) to 23cm (9in) long, plus 27cm (11in) tail (northern Sulawesi echiothrix)
Members of the Nesomyidae family are called nesomyids and include Malagasy rodents, climbing mice, African rock mice, pouched rats, and tufted-tailed rats. They are generally omnivores, and eat seeds, fruit, nuts, roots, stems, and insects. Nesomyidae comprises 67 extant species divided into 21 genera, grouped into six subfamilies: Cricetomyinae, containing 8 species of hamster-rats and pouched rats; Delanymyinae, containing a single species; Dendromurinae, containing 26 species of climbing mice and fat mice; Mystromyinae, containing a single species; Nesomyinae, containing 27 species of short-tailed rats, tufted-tailed rats, and big-footed mice; and Petromyscinae, containing 4 species of rock mice.
Size range: 6–10cm (2–4in) long, plus 6–9cm (2–4in) tail (Brukkaros pygmy rock mouse)
Habitats: Rocky areas and shrubland
Diets: Omnivorous
Family Platacanthomyidae
Members of the Platacanthomyidae family are called platacanthomyids or Oriental dormice. They generally eat fruit, seeds, grain, and roots. Platacanthomyidae comprises two extant species in two genera.
Members of the Spalacidae family are called spalacids and include blind mole-rats, bamboo rats, mole-rats, and zokors. They are primarily herbivores, and eat roots, bulbs, tubers, grass, and seeds, with some species also eating insects. Spalacidae comprises 23 extant species in 7 genera, divided into 3 subfamilies: Myospalacinae contains 6 species of zokors, Rhizomyinae contains 6 species of bamboo rats and mole-rats, Spalacinae contains 11 species of blind mole-rats.
Members of the Gliridae family are called glirids or dormice. They are omnivores and feed on fruit and nuts, as well as invertebrates, birds and their eggs, and small rodents. Gliridae comprises 29 extant species in 9 genera, divided into 3 subfamilies: Glirinae, containing two species; Graphiurinae, containing fifteen species; and Leithiinae, containing twelve species.
Members of the Sciuridae family are called sciurids and include squirrels, chipmunks, and marmots. They primarily feed on fruit, seeds, and nuts, though many species also eat insects, fungi, bark, eggs, and small vertebrates. Sciuridae comprises 284 extant species in 60 genera, divided into 5 subfamilies: Callosciurinae, containing 67 species of Asian squirrels; Ratufinae, containing 4 species of giant squirrels; Sciurillinae, containing a single species of pygmy squirrel; Sciurinae, containing 84 species of flying squirrel and tree squirrels; and Xerinae, containing 128 species of marmots, chipmunks, prairie dogs, and ground squirrels.
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