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: Rodentiaa
Subordo: Sciuromorpha
Familia: Sciuridae
Subfamilia: Sciurinae
Tribus: Pteromyini
Genus: Glaucomys
Species (3): G. oregonensis – G. sabrinus - G. volans
Name
Glaucomys Thomas, 1908: 5
Type species: Mus volans Linnaeus, 1758, by original designation.
References
Primary references
Thomas, O. 1908. The genera and subgenera of the Sciuropterus Group, with descriptions of three new species. Annals and Magazine of Natural History, Series 8, 1: 1–8. BHL
Additional references
Arbogast, B.S., Schumacher, K.I., Kerhoulas, N.J., Bidlack, A.L., Cook, J.A. & Kenagy, G.J. 2017. Genetic data reveal a cryptic species of New World flying squirrel: Glaucomys oregonensis. Journal of Mammalogy 98(4): 1027–1041. DOI: 10.1093/jmammal/gyx055 Reference page.
Links
Glaucomys 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
English: New World flying squirrels, American Flying Squirrels
The three species of New World flying squirrels, genus Glaucomys, are the only species of flying squirrel found in North America.[1][2] They are distributed from Alaska to Honduras. They are similar in many ways to the Eurasian flying squirrels in the genus Pteromys. Two species of New World flying squirrels can be easily distinguished on the basis of size and ventral pelage. Northern flying squirrels, Glaucomys sabrinus are larger and have belly hair that is dark at the base and white at the tip. Southern flying squirrels, Glaucomys volans, are smaller and have belly hairs that are completely white. Humboldt's flying squirrel is more difficult to distinguish from the northern flying squirrel where their ranges overlap. In fact, they were once considered conspecific. Humboldt's flying squirrel is considered a cryptic species. They are generally smaller and darker than northern flying squirrels.
Species
Genu
| Common name | Scientific name and subspecies | Range | Size and ecology | IUCN status and estimated population |
|---|---|---|---|---|
| Humboldt's flying squirrel
|
Glaucomys oregonensis (Bachman, 1839) |
California |
Size: Habitat: Diet: |
|
| northern flying squirrel
|
Glaucomys sabrinus (Shaw, 1801)
Twenty five subspecies
|
North America. |
Size: Habitat: Diet: |
LC |
| southern flying squirrel
|
Glaucomys volans (Linnaeus, 1758)
Eleven subspecies
|
North America, Mexico, Guatemala, and Honduras. |
Size: Habitat: Diet: |
LC |
|---|
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Gliding
Flying squirrels do not actually fly, but rather glide using a membrane called a patagium created by a fold of skin which starts at the wrists of the forearms, extends along the sides of the body, and finishes at the ankles of the hind legs.[3][2] From atop of trees, flying squirrels can initiate glides from a running start [2] or from a stationary position by bringing their limbs under the body, retracting their heads, and then propelling themselves off the tree.[3][2] It is believed that they use triangulation to estimate the distance of the landing area as they often lean out and pivot from side to side before jumping.[1] Once in the air, they form an "X" with their limbs by spreading their long arms forward and out and their long legs backward and out, causing their membrane to stretch into a square-like shape [1] and glide down at angles of 30 to 40 degrees.[2] They manoeuvre with great efficiency in the air, making 90 degree turns around obstacles if needed.[2] Just before reaching a tree, they raise their flattened tails to abruptly change their trajectory upwards and point all of their limbs forward in order to create a parachute effect with the membrane.[1] Upon landing, the limbs break the remainder of the impact and the squirrels usually run to the other side of the trunk in order to avoid any potential predators.[1] They are very clumsy walkers and if they are on the ground in the presence of danger, they will prefer to hide rather than attempt an escape.[3][2]
Fluorescence
Under ultraviolet light, females and males of all 3 species of Glaucomys fluoresce in varying intensities of pink on both dorsal and ventral surfaces.[4] The fluorescence is hypothesized to help the flying squirrels find each other in low light and mimic the plumage of owls to evade predation.[5] This hypothesis has been challenged by Toussaint et al. (2022) [6] who instead suggest that the pink luminescence is a byproduct of the body's waste management. Moreover, these authors argue that it is far from evident that UV illuminating sources that occur naturally are sufficient to elicit luminescence distinguishable from ambient visible light. An ecological role for the pink luminescence is therefore not likely.
References
Walker EP, Paradiso JL. 1975. Mammals of the World. Baltimore: Johns Hopkins University Press.
Forsyth A. 1999. Mammals of North America: Temperate and Arctic Regions. Willowdale: Firefly Books.
Banfield AWF. 1974. The Mammals of Canada. Toronto: University of Toronto Press.
Anich, Paula Spaeth; Martin, Jonathan G.; Olson, Erik R.; Kohler, Allison M. (2019). "Ultraviolet fluorescence discovered in New World flying squirrels (Glaucomys)". Journal of Mammalogy. 100: 21–30. doi:10.1093/jmammal/gyy177.
"Flying squirrels are secretly pink". Nature. 566 (7742): 10. 2019-01-28. Bibcode:2019Natur.566R..10.. doi:10.1038/d41586-019-00307-6. S2CID 256770220.
Toussaint, Severine; Ponstein, Jasper; Thoury, Mathieu; Metivier, Remi; Kalthoff, Daniela; Habermeyer, Benoit; Guilard, Roger; Bock, Steffen; Mortensen, Peter; Sandberg, Sverre; Gueriau, Pierre; Amson, Eli (2022). "Fur glowing under ultraviolet: in situ analysis of porphyrin accumulation in the skin appendages of mammals". Integrative Zoology. 17 (3): 15–26. doi:10.1111/1749-4877.12655. PMID 35500584.
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