''Urocitellus'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

ground squirrel Ground squirrels are rodents of the squirrel family (Sciuridae) that generally live on the ground or in burrows, rather than in trees like the tree squirrels. The term is most often used for the medium-sized ground squirrels, as the larger ones ar ...

s. They were previously believed to belong to the much larger genus ''

Spermophilus ''Spermophilus'' is a genus of ground squirrels in the Sciuridae, squirrel family. As traditionally defined the genus was very species-rich, ranging through Europe, Asia and North America, but this arrangement was found to be paraphyletic to ...

'', but

DNA sequencing DNA sequencing is the process of determining the nucleic acid sequence – the order of nucleotides in DNA. It includes any method or technology that is used to determine the order of the four bases: adenine, thymine, cytosine, and guanine. The ...

of the cytochrome ''b'' gene showed that this group was

paraphyletic Paraphyly is a taxonomic term describing a grouping that consists of the grouping's last common ancestor and some but not all of its descendant lineages. The grouping is said to be paraphyletic ''with respect to'' the excluded subgroups. In co ...

to the

prairie dog Prairie dogs (genus ''Cynomys'') are herbivorous burrowing Marmotini, ground squirrels native to the grasslands of North America. There are five recognized species of prairie dog: black-tailed prairie dog, black-tailed, white-tailed prairie dog ...

s and

marmot Marmots are large ground squirrels in the genus ''Marmota'', with 15 species living in Asia, Europe, and North America. These herbivores are active during the summer, when they can often be found in groups, but are not seen during the winter, w ...

s, and could therefore no longer be retained as a single genus. As a result, ''Urocitellus'' is now considered as a genus in its own right. All but two species are native to the northern and western parts of North America, from

California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...

and

Minnesota Minnesota ( ) is a U.S. state, state in the Upper Midwestern region of the United States. It is bordered by the Canadian provinces of Manitoba and Ontario to the north and east and by the U.S. states of Wisconsin to the east, Iowa to the so ...

through the north-western United States and western

Canada Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun ...

; the Arctic ground squirrel inhabits Arctic terrain on both sides of the

Bering Strait The Bering Strait ( , ; ) is a strait between the Pacific and Arctic oceans, separating the Chukchi Peninsula of the Russian Far East from the Seward Peninsula of Alaska. The present Russia–United States maritime boundary is at 168° 58' ...

, while the long-tailed ground squirrel is exclusively found in Asia. The name of the genus is said to be derived from the Latin ''uro'', meaning "tail" and ''citellus'' for "ground squirrel". The proper word for "tail" in classical Latin is ''cauda''.Lewis, C.T. & Short, C. (1879). ''A Latin dictionary founded on Andrews' edition of Freund's Latin dictionary.'' Oxford: Clarendon Press. ''Oura'' (οὐρά) is the ancient Greek word for "tail".Liddell, H.G. & Scott, R. (1940). ''A Greek-English Lexicon. Revised and augmented throughout by Sir Henry Stuart Jones with the assistance of Roderick McKenzie.'' Oxford: Clarendon Press.

Species

Fourteen species are currently identified: Genus ''Urocitellus'' * Uinta ground squirrel, ''Urocitellus armatus'' *

Belding's ground squirrel Belding's ground squirrel (''Urocitellus beldingi''), also called pot gut, sage rat or picket-pin, is a squirrel that lives on mountains in the Western United States, western United States. In California, it often is found at in meadows between ...

, ''Urocitellus beldingi'' * Northern Idaho ground squirrel, ''Urocitellus brunneus'' * Merriam's ground squirrel, ''Urocitellus canus'' *

Columbian ground squirrel The Columbian ground squirrel (''Urocitellus columbianus'') is a species of rodent common in certain regions of Canada and the northwestern United States. It is the second largest member of the genus ''Urocitellus'', which is part of the tribe Ma ...

, ''Urocitellus columbianus'' * Wyoming ground squirrel, ''Urocitellus elegans'' * Southern Idaho ground squirrel, ''Urocitellus endemicus'' * Piute ground squirrel, ''Urocitellus mollis'' * Arctic ground squirrel, ''Urocitellus parryii'' *

Richardson's ground squirrel Richardson's ground squirrel (''Urocitellus richardsonii''), also known as the dakrat or flickertail, is a North American ground squirrel in the genus ''Urocitellus''. Like a number of other ground squirrels, they are sometimes called prairie dog ...

, ''Urocitellus richardsonii'' * Snake River Plains ground squirrel, ''Urocitellus idahoensis'' * Townsend's ground squirrel, ''Urocitellus townsendii'' * Long-tailed ground squirrel, ''Urocitellus undulatus'' * Washington ground squirrel, ''Urocitellus washingtoni''

References

Rodent genera {{ground-squirrel-stub