The alligator snapping turtle (Macrochelys temminckii) is a large species of turtle in the family Chelydridae. The species is native to freshwater habitats in the United States. M. temminckii is one of the heaviest freshwater turtles in the world. It is the largest freshwater species of turtle in North America. It is often associated with, but not closely related to, the common snapping turtle, which is in the genus Chelydra. The specific epithet temminckii is in honor of Dutch zoologist Coenraad Jacob Temminck. Taxonomy Although it was once believed that only one extant species exists in the genus Macrochelys, recent studies have shown that there are two species, the other being the Suwannee snapping turtle (M. suwanniensis) of the Suwannee River. A third species, the Apalachicola snapping turtle (M. apalachicolae), has been proposed, but is generally not recognized. The alligator snapping turtle is given its common name because of its immensely powerful jaws and distinct ridges on its shell that are similar in appearance to the rough, ridged skin of an alligator. It is also slightly less commonly known as "the loggerhead snapper" (not to be confused with the loggerhead sea turtle or loggerhead musk turtle). Distribution and habitat The alligator snapping turtle is found primarily in freshwaters of the southeastern United States. It is found from the Florida Panhandle west to East Texas, north to southeastern Kansas, Missouri, southeastern Iowa, western Illinois, southern Indiana, western Kentucky, Louisiana, and western Tennessee. Typically, only nesting females venture onto open land. They are generally only found in bodies of water that flow into the Gulf of Mexico and usually do not occur in isolated wetlands or ponds. A study done found that the turtles prefer places with canopy cover, overhanging trees, shrubs, dead submerged trees, and beaver dens. There are non-native established invasive populations of the alligator snapping turtle in South Africa. The average home range for an individual is 750 m. Females will have large home ranges. Description The alligator snapping turtle is characterized by a large, heavy head, and a long, thick shell with three dorsal ridges of large scales (osteoderms), giving it a primitive appearance reminiscent of some of the plated dinosaurs, most notably Ankylosaurus. It can be immediately distinguished from the common snapping turtle by the three distinct rows of spikes and raised plates on the carapace, whereas the common snapping turtle has a smoother carapace. M. temminckii