Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Cladus: Synapsida
Cladus: Eupelycosauria
Cladus: Sphenacodontia
Cladus: Sphenacodontoidea
Cladus: Therapsida
Cladus: Theriodontia
Cladus: Cynodontia
Cladus: Eucynodontia
Cladus: Probainognathia
Cladus: Prozostrodontia
Cladus: Mammaliaformes
Classis: Mammalia
Subclassis: Trechnotheria
Infraclassis: Zatheria
Supercohors: Theria
Cohors: Eutheria
Infraclassis: Placentalia
Cladus: Boreoeutheria
Superordo: Euarchontoglires
Ordo: Rodentia
Subordo: Sciuromorpha
Familia: Sciuridae
Subfamilia: Xerinae
Tribus: Marmotini
Genus: Ammospermophilus – Callospermophilus – Cynomys – Ictidomys – Marmota – Notocitellus – Otospermophilus – Sciurotamias – Spermophilus – Poliocitellus – Urocitellus – Xerospermophilus – Tamias
Name
Marmotini Pocock, 1923
References
Helgen, K.M., Cole, F.R., Helgen, L.E. & Wilson, D.E. 2009. Generic Revision in the Holarctic Ground Squirrel Genus Spermophilus. Journal of Mammalogy 90(2): 270–305. DOI: 10.1644/07-MAMM-A-309.1 JSTOR PDF Reference page.
Marmotini in Mammal Species of the World.
Wilson, Don E. & Reeder, DeeAnn M. (Editors) 2005. Mammal Species of the World – A Taxonomic and Geographic Reference. Third edition. ISBN 0-8018-8221-4.
Vernacular names
Deutsch: Echte Erdhörnchen
English: Ground squirrel
suomi: Marmotini
latviešu: Murkšķi
Nederlands: Grondeekhoorns
polski: Świszcze
中文: 地松鼠
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 are more commonly known as marmots (genus Marmota) or prairie dogs, while the smaller and less bushy-tailed ground squirrels tend to be known as chipmunks (genus Tamias).
Together, they make up the "marmot tribe" of squirrels, Marmotini, a clade within the large and mainly ground squirrel subfamily Xerinae, and containing six living genera. Well-known members of this largely Holarctic group are the marmots (Marmota), including the American groundhog, the chipmunks, the susliks (Spermophilus), and the prairie dogs (Cynomys). They are highly variable in size and habitus, but most are remarkably able to rise up on their hind legs and stand fully erect comfortably for prolonged periods. They also tend to be far more gregarious than other squirrels, and many live in colonies with complex social structures. Most Marmotini are rather short-tailed and large squirrels. At up to 8 kg (18 lb) or more, certain marmots are the heaviest squirrels.[1][2]
The chipmunks of the genus Tamias frequently spend time in trees. Also closer to typical squirrels in other aspects, they are occasionally considered a tribe of their own (Tamiini).[3]
Evolution and systematics
20,000-year-old Arctic ground squirrel mummy
Palaeosciurus from Europe is the oldest known ground squirrel species, and it does not seem to be particularly close to any of the two to three living lineages (subtribes) of Marmotini. The oldest fossils are from the Early Oligocene, more than 30 million years ago (Mya), but the genus probably persisted at least until the mid-Miocene, some 15 Mya.
Where the Marmotini originated is unclear. The subtribes probably diverged in the early to mid-Oligocene, as primitive marmots and chipmunks are known from the Late Oligocene of North America. The fossil record of the "true" ground squirrels is less well known, beginning only in the mid-Miocene, when modern susliks and prairie dogs are known to have inhabited their present-day range already.
Whether the Marmotini dispersed between North America and Eurasia via "island-hopping" across the Bering Straits or the Greenland region—both of which were temperate habitat at that time—and from which continent they dispersed to which, or if both continents brought forth distinct subtribes which then spread to the other, is not known and would probably require more fossil material to be resolved. In any case, the fairly comprehensive fossil record of Europe—at the relevant time separated from Asia by the Turgai Sea—lacks ancient Marmotini except the indeterminate Palaeosciurus, which might be taken to indicate an East Asian or western North American origin with trans-Beringia dispersal being the slightly more satisfying hypothesis. This is also supported by the enigmatic Chinese genus Sciurotamias, which may be the most ancient living lineage of this group, or—if the chipmunks are not included here—close to the common ancestor of the Tamiini and the Marmotini sensu stricto.
In any case, expansion of the Marmotini to Africa was probably prevented by competitive exclusion by their close relatives the Protoxerini and Xerini—the native terrestrial and palm squirrels of that continent, which must have evolved at the same time as the Marmotini did.
Size
Ground squirrels can measure anywhere from about 7.2 inches (18 cm) in height up to nearly 30 inches (76 cm). They can weigh between 0.09 pounds (0.041 kg) and 24 pounds (11 kg).[4]
Habitat
Open areas including rocky outcrops, fields, pastures, and sparsely wooded hillsides comprise their habitat.[5] Ground squirrels also live in grassy areas such as pastures, golf courses, cemeteries, and parks.
Defense mechanisms
Ground squirrels have developed several defense mechanisms to protect themselves from predators. When threatened, they emit high-pitched warning calls to alert others in their colony. This alarm call serves as an early warning system, allowing nearby squirrels to seek cover. The squirrels spend about one-third of their time standing to watch and when a predator is on sight, they stop and watch 60% of the time.[6] Ground squirrels are also known for their burrowing behavior. They have intricate tunnel systems with multiple entrances, which provide escape routes from predators. When a threat approaches, they quickly retreat underground, where they are safe from most predators. Their burrows are designed with multiple chambers and ranges between 5 and 30 feet (1.5 and 9.1 m),[7] making it challenging for predators to reach them. This combination of vocal warnings and burrow construction makes ground squirrels highly adapted to evade danger and survive in the wild.
California ground squirrel in a tree
Diet
Ground squirrels are omnivorous, and not only eat a diet rich in fungi, nuts, fruits, and seeds, but also occasionally eat insects, eggs, and other small animals.[8]
Subtribes and genera
Watchful "rock chuck" or yellow-bellied marmot (Marmota flaviventris) atop Mount Dana, Yosemite National Park in California
Basal and incertae sedis genera
†Palaeosciurus (fossil)
Callospermophilus
Notocitellus
Otospermophilus (American rock squirrels)
Poliocitellus (Franklin's ground squirrel)
Sciurotamias (Chinese rock squirrels)
Urocitellus
Xerospermophilus
Subtribe Tamiina: chipmunks (might be full tribe)
Eutamias
Neotamias
†Nototamias (fossil)
Tamias
Subtribe Marmotina: marmots and prairie dogs
†Arctomyoides (fossil)
†Miospermophilus (fossil)
†Paenemarmota (fossil)
†Palaearctomys (fossil)
†Protospermophilus (fossil)
Marmota
Cynomys (prairie dogs)
Subtribe Spermophilina: true ground squirrels
†Spermophilinus (fossil)
Ammospermophilus
Ictidomys: Thirteen-lined ground squirrel and related species
Spermophilus
Cladogram
Below is a partial cladogram of ground squirrels (tribe Marmotini, but excluding the Tamiina subtribe and some basal genera) derived from maximum parsimony analysis.[9]
Notocitellus
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See also
Xerini - the related "ground squirrels" of Asia and Africa
Tree squirrel
References
Kryštufek, B.; B. Vohralík (2013). "Taxonomic revision of the Palaearctic rodents (Rodentia). Part 2. Sciuridae: Urocitellus, Marmota and Sciurotamias". Lynx, N. S. (Praha). 44: 27–138.
Armitage, K.B.; Blumstein, D.T. (2002). "Body-mass diversity in marmots. Holarctic marmots as a factor of biodiversity". In K.B. Armitage; V.Yu. Rumiantsev (eds.). Holarctic Marmots as a Factor of Biodiversity. ABF Publishing House. pp. 22–32.
Steppan et al. (2004)
Karels, Tim (2004). Grzimek's Animal Life Encyclopedia (Vol. 16: Mammals V. 2nd ed.). Gale. p. 143.
National Audubon Society Field Guide to Mammals
van der Marel, Annemarie; Marel, Annemarie van der; Waterman, Jane M.; López-Darias, Marta (2021-10-16). "Barbary ground squirrels do not have a sentinel system but instead synchronize vigilance". Behavioral Ecology and Sociobiology. 75 (11): 153. doi:10.1007/s00265-021-03094-1. ISSN 1432-0762.
"Ground Squirrel / Home and Landscape / UC Statewide IPM Program (UC IPM)". ipm.ucanr.edu. Retrieved 2023-10-25.
"Squirrels: Diet, Habits & Other Facts".
Helgen et al. 2009, p. 274.
Further reading
Helgen, Kristofer M.; Cole, F. Russell; Helgen, Lauren E.; Wilson, Don E. (April 2009). "Generic Revision in the Holarctic Ground Squirrel Genus Spermophilus". Journal of Mammalogy. 90 (2): 270–305. doi:10.1644/07-MAMM-A-309.1. S2CID 28483038.
Steppan, Scott J.; Storz, B.L. & Hoffmann, R.S. (2004): "Nuclear DNA phylogeny of the squirrels (Mammalia: Rodentia) and the evolution of arboreality from c-myc and RAG1". Mol. Phyl. Evol. 30(3): 703–719. doi:10.1016/S1055-7903(03)00204-5 PDF fulltext
Thorington, R.W. & Hoffmann, R.S. (2005): Family Sciuridae. In: Mammal Species of the World—A Taxonomic and Geographic Reference: 754–818. Johns Hopkins University Press, Baltimore.
External links
Wikimedia Commons has media related to Marmotini.
About California Ground Squirrels
vte
Living species of tribe Marmotini (ground squirrels)
Taxon identifiers
Wikidata: Q389250 Wikispecies: Marmotini C
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