Pantherophis is a genus of nonvenomous colubrid snakes endemic to North America and Central America, commonly called rat snakes, fox snakes, and corn snakes. All are powerful constrictors and help control rodent populations. Some taxonomic classification systems have accepted the proposed classification, while others have not.
Although Pantherophis was originally proposed in 1843, in more recent history, these species were placed in the genus Elaphe. In 2002, Utiger et al. raised a taxonomic suggestion to resurrect the genus Pantherophis based on mitochondrial DNA evidence suggesting the New World rat snakes are more closely related to king snakes than to the Old World rat snakes. This was confirmed by later phylogenetic studies.
However, the International Commission on Zoological Nomenclature rejected the renaming, thus Elaphe remains the more widely recognized and broadly accepted genus name. The ITIS now identifies all species names that use Pantherophis as "valid" names - no longer using Elaphe.
|Image||Scientific name||Common name||Geographic range|
|Pantherophis alleghaniensis (Holbrook, 1836)||Eastern rat snake||United States east of the Apalachicola River in Florida, east of the Chattahoochee River in Georgia, east of the Appalachian Mountains, north to southeastern New York and western Vermont, eastern Pennsylvania, Maryland, South Carolina, North Carolina, Georgia, south to the Florida Keys|
|Pantherophis bairdi (Yarrow, 1880)||Baird's rat snake||Southwestern United States and adjacent northeastern Mexico.|
|Pantherophis emoryi (Baird & Girard, 1853)||Great Plains rat snake||United States, from Missouri to Nebraska, to Colorado, south to Texas, and into northern Mexico|
|Pantherophis gloydi (Conant, 1940)||Eastern fox snake||Eastern Great Lakes region of the United States, as well as adjacent western Ontario in Canada.|
|Pantherophis guttatus (Linnaeus, 1766)||Corn snake||Southeastern and central United States.|
|Pantherophis obsoletus (Say, 1823)||Western rat snake or Texas ratsnake||West of the Mississippi River, from eastern and southern Iowa southward through Missouri and Arkansas to western Louisiana, westward to eastern Texas, northward through Oklahoma and eastern Kansas to southeastern Nebraska.|
|Pantherophis ramspotti Crother, White, Savage, Eckstut, Graham & Gardner, 2011||Western fox snake||United States, west of the Mississippi River|
|Pantherophis slowinskii (Burbrink, 2002)||Slowinski's corn snake||Louisiana, eastern Texas, and Arkansas|
|Pantherophis spiloides (A.M.C. Duméril, Bibron & A.H.A. Duméril, 1854)||Gray rat snake or central rat snake||Eastern and Central United States, west of the Appalachian Mountains and east of the Mississippi River|
|Pantherophis vulpinus (Baird & Girard, 1853)||Eastern fox snake||Upper Midwestern United States, east of the Mississippi River|
In recent years, some taxonomic controversy arose over the genus of North American rat snakes. Based on mitochondrial DNA, Utiger et al. (2002) showed North American rat snakes of the genus Elaphe, along with closely related genera such as Pituophis and Lampropeltis, form a monophyletic group separate from Old World members of the genus. They therefore suggested the resurrection of the available name Pantherophis Fitzinger for all North American taxa (north of Mexico).
The reception to the proposed reclassification has been mixed. In 2008, the Society for the Study of Amphibians and Reptiles accepted the taxonomic change to Pantherophis.[verification needed]NatureServe and GBIF use Pantherophis names. ITIS also now identifies all species names that use Pantherophis as "valid" names.CITES recognizes Elaphe and does not recognize Pantherophis.