Gopherus is a genus of fossorial tortoises commonly referred to as gopher tortoises. The gopher tortoise is grouped with land tortoises that originated 60 million years ago, in North America. A genetic study has shown that their closest relatives are in the Asian genus Manouria. The gopher tortoises live in the southern United States from California's Mojave Desert across to Florida, and in parts of northern Mexico. Gopher tortoises are so named because of their ability to dig large, deep burrows; those of the gopher tortoise can be up to 40 feet (12 m) in length and 10 feet (3.0 m) in depth. These burrows are used by a variety of other species, including mammals, other reptiles, amphibians, and birds. Gopher tortoises are 20–50 cm (7.9–19.7 in) in length, depending on the species. All six species are found in xeric habitats. Numerous extinct species are known, the oldest dating to the Priabonian stage of the Late Eocene of the United States.
Temporal range: Priabonian–Recent
|Gopher tortoise, Gopherus polyphemus|
Gopher tortoises are mainly herbivores that feed on low growing plant life. Their diet consists mostly of grasses and legumes. Gopher tortoises are scavengers and will also feed on small berries, fruits, carrion, and excrement. Gopher tortoises are rarely seen drinking from still water. Most of the water gopher tortoises consume comes from within the food they eat.
Gopher tortoises usually mate during April and May. The female will then choose either a sunny spot nearby or a sandy mound in front of her burrow to lay between 3 and 15 eggs. The eggs then hatch from 70 to 100 days later. Once hatched, the baby tortoises spend most of their time in their mother's burrow until they learn to dig their own burrow. They do not reach maturity until they are around 10 to 15 years old. Gopher tortoises have an abbreviated mating season in early spring, when male tortoises visit the female tortoise' burrows and mate with them.
In July 2011, researchers decided on the basis of DNA, and morphological and behavioral data that the Sonoran and Mojave populations of the desert tortoise, G. agassizii were distinct species. This newly described species was named G. morafkai, or the Morafka's desert tortoise. The acceptance of G. morafkai reduced the range of G. agassizii by about 70% In 2016, based on a large-scale genetic analysis, ecological and morphological data, researchers proposed a split between the Sonoran and Sinaloan populations. This southernmost member of the Gopherus genus was named G. evgoodei. As such, there are currently six recognized species in the genus Gopherus:
Listed alphabetically by binomial name:
|Image||Common Name||Scientific name||Distribution|
|Mojave desert tortoise or Agassiz's desert tortoise||Gopherus agassizii (Cooper, 1863)||the Mojave and Sonoran Deserts of the southwestern United States and northwestern Mexico and the Sinaloan thornscrub of northwestern Mexico|
|Texas tortoise||Gopherus berlandieri (Agassiz, 1857)||southern Texas southward into the Mexican states of Coahuila, Nuevo León, and Tamaulipas.|
|Sinaloan desert tortoise or Goode's desert tortoise||Gopherus evgoodei Edwards et al., 2016||Mexico (Sonora, Sinaloa)|
|Bolson tortoise||Gopherus flavomarginatus Legler, 1959||north-central Mexico|
|Sonoran desert tortoise or Morafka's desert tortoise||Gopherus morafkai Murphy et al., 2011||Mexico (Sonora and Sinaloa)|
|Gopher tortoise||Gopherus polyphemus (Daudin, 1802)||southeastern United States.|
Members of Gopherus that became extinct in the late Pleistocene:
Populations of all six species of Gopherus have declined dramatically. In the past, gopher tortoises were hunted for their meat, which was used in stews. Currently the most significant threat to their survival is habitat destruction, but the pet trade and collisions with vehicles have also taken their toll. To help decrease gopher tortoise death due to collisions with vehicles, the US Department of Transportation in Mississippi has recently placed angled fences along the road side to keep tortoise from wandering onto the highways near their habitats. On November 9, 2009, the US Fish and Wildlife Service proposed rulemaking to include the eastern population of the gopher tortoise, Gopherus polyphemus, in the List of Threatened Wildlife. In 2018, the IUCN Tortoise and Freshwater Turtle Specialist Group recommended a re-assessment and re-classification of all six Gopherus species This reclassification would move G. agassizii from Vulnerable (VU) to Critically Endangered (CR), G. berlandieri from Near Endangered (NE) to Near Threatened (NT), G. evgoodei from Near Endangered (NE) to Vulnerable (VU), G. flavomarginatus from Vulnerable (VU) to Critically Endangered (CR), G. morafkai from Near Endangered (NE) to Vulnerable (VU) and G. polyphemus from Vulnerable (VU) to Endangered (EN).
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