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†Allomyidae Aplodontiidae †Mylagaulidae Sciuridae †Reithroparamyidae Gliridae

Sciuromorpha
Sciuromorpha
("squirrel-like") is a rodent clade that includes several different rodent families. It includes all members of the Sciuridae (the squirrel family) as well as the mountain beaver species. Traditionally, the term has been defined on the basis of the shape of the infraorbital canal. A sciuromorphous zygomasseteric system is characterized by attachment of the lateral masseter muscle along the side of the rostrum. Unlike hystricomorphous and myomorphous rodents, the medial masseter muscle does not pass through the infraorbital canal. Among extant rodents, only the families Sciuridae, Castoridae, Heteromyidae, and Geomyidae
Geomyidae
are truly sciuromorphous. Some authorities would exclude the Geomyidae
Geomyidae
and Heteromyidae
Heteromyidae
from that list due to the attachment of the medial masseter directly behind the zygomatic arch. Carleton and Musser (2005) redefined the rodent suborders on morphological and molecular grounds. They defined the Sciuromorpha
Sciuromorpha
as including three families, Sciuridae, Aplodontiidae, and Gliridae. Of these, only the Sciuridae
Sciuridae
are truly sciuromorphous. The Aplodontiidae are protrogomorphous and the Gliridae
Gliridae
are myomorphous. The connection between Aplodontiidae and Sciuridae
Sciuridae
has been proposed numerous times in the past. The two families have been united into a common infraorder (Sciurida) or superfamily (Sciuroidea). It has long been suggested that dormice (Gliridae) are not particularly related to the Myomorpha, and their zygomasseteric structure has been termed "pseudomyomorphy". The connection between squirrels and dormice has been almost exclusively suggested through genetic studies, and to a lesser degree via the fossil rodent Reithroparamys.

Skull of an oriental giant squirrel displaying a sciuromorphous zygomatic system

Current families[edit] The suborder Sciuromorpha
Sciuromorpha
contains 307 living species in 61 genera and three families. At least three extinct families are also recognised.

†Allomyidae Aplodontiidae - mountain beaver †Mylagaulidae Sciuridae
Sciuridae
- squirrels, chipmunks, marmots, flying squirrels, etc. †Reithroparamyidae Gliridae
Gliridae
- dormice

Historical families[edit]

Castoridae
Castoridae
- beavers Geomyidae
Geomyidae
- pocket gophers Heteromyidae
Heteromyidae
- kangaroo rats and mice

References[edit]

Carleton, M. D. and G. G. Musser. 2005. Order Rodentia. pp745–752 in Mammal
Mammal
Species of the World A Taxonomic and Geographic Reference (D. E. Wilson and D. M. Reeder eds.). Baltimore, Johns Hopkins University Press.

Wikispecies
Wikispecies
has information related to Sciuromorpha

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Extant families in order Rodentia

Kingdom: Animalia Phylum: Chordata Class: Mammalia Infraclass: Eutheria Superorder: Euarchontoglires

Sciuromorpha ("Squirrel-like")

Aplodontiidae (Mountain beaver) Gliridae
Gliridae
(Dormice) Sciuridae
Sciuridae
(Squirrels, chipmunks, marmots, susliks and prairie dogs)

Castorimorpha ("Beaver-like")

Castoroidea Castoridae
Castoridae
(Beavers)

Geomyoidea Geomyidae
Geomyidae
(Pocket gophers) Heteromyidae
Heteromyidae
(Kangaroo rats and mice, pocket mice)

Myomorpha ("Mouse-like")

Dipodoidea Dipodidae
Dipodidae
(Jerboas, jumping mice and birch mice)

Muroidea Platacanthomyidae
Platacanthomyidae
(Oriental dormice) Spalacidae
Spalacidae
(Zokors, bamboo rats, mole rats, blind mole rats) Calomyscidae (Mouse-like hamsters) Nesomyidae
Nesomyidae
(Malagasy rats and relatives) Cricetidae
Cricetidae
(Hamsters and relatives) Muridae
Muridae
(House mouse and relatives)

Anomaluromorpha ("Anomalure-like")

Anomaluridae (Anomalures) Pedetidae
Pedetidae
(Springhares)

Hystricomorpha ("Porcupine-like")

Ctenodactylidae (Gundis) Diatomyidae
Diatomyidae
(Laotian rock rat) Hystricidae (Old World porcupines)

Phiomorpha Bathyergidae (Blesmols) Petromuridae (Dassie rat) Thryonomyidae (Cane rats)

Caviomorpha
Caviomorpha
(New World hystricognaths) Erethizontidae (New World porcupines) Caviidae
Caviidae
(Cavies) Cuniculidae (Pacas) Dasyproctidae
Dasyproctidae
(Agoutis and acouchis) Dinomyidae
Dinomyidae
(Pacarana) Capromyidae (Hutias) Ctenomyidae (Tuco-tucos) Echimyidae
Echimyidae
(Spiny rats and coypus) Octodontidae
Octodontidae
(Degus and relatives) Abrocomidae (Chinchilla rats) Chinchillidae
Chinchillidae
(Chinchillas and viscachas)

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Prehistoric families in order Rodentia

Kingdom: Animalia Phylum: Chordata Class: Mammalia Infraclass: Eutheria Superorder: Euarchontoglires

Sciuromorpha

Allomyidae Mylagaulidae Reithroparamyidae

Castorimorpha

Eutypomyidae Rhizospalacidae Eomyidae Florentiamyidae Heliscomyidae

Myomorpha

Armintomyidae Anomalomyidae Simimyidae

Anomaluromorpha

Parapedetidae

Hystricomorpha

Tamquammyidae Gobiomyidae Yuomyidae Chapattimyidae Tsaganomyidae "Baluchimyinae" Bathyergoididae Myophiomyidae Diamantomyidae Phiomyidae Kenyamyidae Cephalomyidae Eocardiidae Neoepiblemidae Heptaxodontidae

incertae sedis

Eurymylidae Alagomyidae Archetypomyidae Cocomyidae Ivanantoniidae Laredomyidae Ischyromyidae Theridomyidae Protoptychidae Zegdoumyidae Sciuravidae Cylindrodontidae Zelomyidae

See also: Category

Taxon identifiers

Wd: Q724477 ADW: Sciuromorpha EoL: 2846678 ITIS: 18

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