According to the

International Union for Conservation of Nature The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of nat ...

(IUCN), 93

reptile Reptiles, as most commonly defined are the animals in the class Reptilia ( ), a paraphyletic grouping comprising all sauropsids except birds. Living reptiles comprise turtles, crocodilians, squamates ( lizards and snakes) and rhynchoce ...

and

amphibian Amphibians are four-limbed and ectothermic vertebrates of the class Amphibia. All living amphibians belong to the group Lissamphibia. They inhabit a wide variety of habitats, with most species living within terrestrial, fossorial, arbor ...

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate ...

in the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territo ...

are

threatened Threatened species are any species (including animals, plants and fungi) which are vulnerable to endangerment in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of ''critical depensa ...

with

extinction Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed an ...

. The IUCN has classified each of these species into one of three

conservation status The conservation status of a group of organisms (for instance, a species) indicates whether the group still exists and how likely the group is to become extinct in the near future. Many factors are taken into account when assessing conservatio ...

es: vulnerable ,

endangered An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and inv ...

, and critically endangered .

Order
Crocodilia Crocodilia (or Crocodylia, both ) is an order of mostly large, predatory, semiaquatic reptiles, known as crocodilians. They first appeared 95 million years ago in the Late Cretaceous period (Cenomanian stage) and are the closest livin ...
(crocodilians)

Family

Crocodylidae Crocodiles ( family Crocodylidae) or true crocodiles are large semiaquatic reptiles that live throughout the tropics in Africa, Asia, the Americas and Australia. The term crocodile is sometimes used even more loosely to include all extant ...

(crocodiles) *

American crocodile The American crocodile (''Crocodylus acutus'') is a species of crocodilian found in the Neotropics. It is the most widespread of the four extant species of crocodiles from the Americas, with populations present from South Florida and the coast ...

(''Crocodylus acutus'')

Order
Testudines Turtles are an order of reptiles known as Testudines, characterized by a special shell developed mainly from their ribs. Modern turtles are divided into two major groups, the Pleurodira (side necked turtles) and Cryptodira (hidden necked t ...
(turtles)

Family Chelydridae (snapping turtles) * Alligator snapping turtle (''Macrochelys temminckii'') Family Kinosternidae (mud turtles and musk turtles) * Flattened musk turtle (''Sternotherus depressus'') Family

Emydidae Emydidae (Latin ''emys'' (freshwater tortoise) + Ancient Greek εἶδος (''eîdos'', “appearance, resemblance”)) is a family of testudines (turtles) that includes close to 50 species in 10 genera. Members of this family are commonly calle ...

(pond turtles) * Spotted turtle (''Clemmys guttata'') * Bog turtle (''Glyptemys muhlenbergii'') *

Wood turtle The wood turtle (''Glyptemys insculpta'') is a species of turtle endemic to North America. It is in the genus '' Glyptemys'', a genus which contains only one other species of turtle: the bog turtle (''Glyptemys muhlenbergii'' ). The wood tur ...

(''Glyptemys insculpta'') * Common box turtle (''Terrapene carolina'') *

Blanding's turtle Blanding's turtle (''Emydoidea blandingii'') is a semi-aquatic turtle of the family Emydidae. This species is native to central and eastern parts of Canada and the United States. It is considered to be an endangered species throughout much of its ...

(''Emys blandingii'') *

Western pond turtle The Western pond turtle (''Actinemys marmorata''), also known commonly as the Pacific pond turtle is a species of small to medium-sized turtle in the family Emydidae. The species is endemic to the western coast of the United States and Mexico, ...

(''Actinemys marmorata'') * Barbour's map turtle (''Graptemys barbouri'') * Cagle's map turtle (''Graptemys caglei'') * Yellow-blotched map turtle (''Graptemys flavimaculata'') * Pascagoula map turtle (''Graptemys gibbonsi'') ** Pearl River map turtle (''Graptemys pearlensis'') , species not recognized by SSAR * Ringed map turtle (''Graptemys oculifera'') * Big Bend slider (''Trachemys gaigeae'') * Alabama red-bellied cooter (''Pseudemys alabamensis'') Family Testudinidae (tortoises) *

Gopher tortoise The gopher tortoise (''Gopherus polyphemus'') is a species of tortoise in the family Testudinidae. The species is native to the southeastern United States. The gopher tortoise is seen as a keystone species because it digs burrows that provide s ...

(''Gopherus polyphemus'') *

Desert tortoise The desert tortoise (''Gopherus agassizii''), is a species of tortoise in the Family (biology), family Testudinidae. The species is native to the Mojave Desert, Mojave and Sonoran Deserts of the southwestern United States and northwestern Mexic ...

(''Gopherus agassizii'') Family

Cheloniidae Cheloniidae is a family of typically large marine turtles that are characterised by their common traits such as, having a flat streamlined wide and rounded shell and almost paddle-like flippers for their forelimbs. They are the only sea turtles t ...

(sea turtles) *

Loggerhead sea turtle The loggerhead sea turtle (''Caretta caretta'') is a species of oceanic turtle distributed throughout the world. It is a marine reptile, belonging to the family Cheloniidae. The average loggerhead measures around in carapace length when ful ...

(''Caretta caretta'') *

Green sea turtle The green sea turtle (''Chelonia mydas''), also known as the green turtle, black (sea) turtle or Pacific green turtle, is a species of large sea turtle of the family Cheloniidae. It is the only species in the genus ''Chelonia''. Its range ext ...

(''Chelonia mydas'') (Hawaiian subpopulation: ) *

Hawksbill sea turtle The hawksbill sea turtle (''Eretmochelys imbricata'') is a critically endangered sea turtle belonging to the family Cheloniidae. It is the only extant species in the genus ''Eretmochelys''. The species has a global distribution, that is largel ...

(''Eretmochelys imbricata'') *

Kemp's ridley sea turtle Kemp's ridley sea turtle (''Lepidochelys kempii''), also called the Atlantic ridley sea turtle, is the rarest species of sea turtle and is the world's most endangered species of sea turtle. It is one of two living species in the genus '' Lepido ...

(''Lepidochelys kempii'') *

Olive ridley sea turtle The olive ridley sea turtle (''Lepidochelys olivacea''), also known commonly as the Pacific ridley sea turtle, is a species of turtle in the family Cheloniidae. The species is the second-smallest and most abundant of all sea turtles found in ...

(''Lepidochelys olivacea'') Family Dermochelyidae (leatherback sea turtle) *

Leatherback sea turtle The leatherback sea turtle (''Dermochelys coriacea''), sometimes called the lute turtle or leathery turtle or simply the luth, is the largest of all living turtles and the heaviest non-crocodilian reptile, reaching lengths of up to and weights ...

(''Dermochelys coriacea'') (East Pacific Ocean subpopulation - i.e. Hawaiian Is.: , West Pacific Ocean subpopulation: , Northwest Atlantic Ocean subpopulation: ) Family

Trionychidae The Trionychidae are a taxonomic family of a number of turtle genera, commonly known as softshell turtles. The family was erected by Leopold Fitzinger in 1826. Softshells include some of the world's largest freshwater turtles, though many can ...

(softshells) * Wattle-necked softshell turtle (''Palea steindachneri'') (introduced)

Order
Squamata Squamata (, Latin ''squamatus'', 'scaly, having scales') is the largest order of reptiles, comprising lizards, snakes, and amphisbaenians (worm lizards), which are collectively known as squamates or scaled reptiles. With over 10,900 species, i ...
(scaled reptiles)

Family Crotaphytidae (collared lizards) * Reticulated collared lizard (''Crotaphytus reticulatus'') * Blunt-nosed leopard lizard (''Gambelia sila'') Family

Phrynosomatidae The Phrynosomatidae are a diverse family of lizards, sometimes classified as a subfamily (Phrynosomatinae), found from Panama to the extreme south of Canada. Many members of the group are adapted to life in hot, sandy deserts, although the spi ...

(horned lizards and spiny lizards) * Dunes sagebrush lizard (''Sceloporus arenicolus'') * Coachella Valley fringe-toed lizard (''Uma inornata'') Family

Teiidae Teiidae is a family of autarchoglossan lizards native to the Americas. Members of this family are generally known as whiptails or racerunners; however, tegus also belong to this family. Teiidae is sister to the Gymnopthalmidae, and both famili ...

(whiptails) * Little white whiptail (''Aspidoscelis gypsi'') Family Scincidae (skinks) * Florida sand skink (''Neoseps reynoldsi'') Family Xantusiidae (night lizards) * Sandstone night lizard (''Xantusia gracilis'') Family

Anguidae Anguidae refers to a large and diverse family of lizards native to the Northern Hemisphere. Common characteristics of this group include a reduced supratemporal arch, striations on the medial faces of tooth crowns, osteoderms, and a lateral fold ...

(glass lizards, alligator lizards, and relatives) * Panamint alligator lizard (''Elgaria panamintina'') Family

Colubridae Colubridae (, commonly known as colubrids , from la, coluber, 'snake') is a family of snakes. With 249 genera, it is the largest snake family. The earliest species of the family date back to the Oligocene epoch. Colubrid snakes are found on ever ...

(colubrid snakes) * Southern hog-nosed snake (''Heterodon simus'') * Louisiana pine snake (''Pituophis ruthveni'') * Rim rock crown snake (''Tantilla oolitica'') * Giant garter snake (''Thamnophis gigas'') Family

Pythonidae The Pythonidae, commonly known as pythons, are a family of nonvenomous snakes found in Africa, Asia, and Australia. Among its members are some of the largest snakes in the world. Ten genera and 42 species are currently recognized. Distribu ...

(pythons) *

Indian Python The Indian python (''Python molurus'') is a large python species native to tropical and subtropical regions of the Indian subcontinent and Southeast Asia. It is also known by the common names black-tailed python, Indian rock python, and Asian ...

(''Python molurus'') (introduced)

Order
Caudata The Caudata are a group of amphibians containing the extant salamanders ( Urodela) and all extinct species of amphibians more closely related to salamanders than to frogs. They are typically characterized by a superficially lizard-like appearan ...
(salamanders)

Family

Proteidae The family Proteidae is a group of aquatic salamanders found today in the Balkan Peninsula and North America. The range of the genus ''Necturus'' (commonly known as waterdogs or mudpuppies) runs from southern central Canada, through the midwe ...

(waterdogs) * Alabama waterdog (''Necturus alabamensis'') Family Ambystomatidae (mole salamanders) * Reticulated flatwoods salamander (''Ambystoma bishopi'') * California tiger salamander (''Ambystoma californiense'') * Frosted flatwoods salamander (''Ambystoma cingulatum'') Family Rhyacotritonidae (torrent salamanders) * Olympic torrent salamander (''Rhyacotriton olympicus'') Family

Salamandridae Salamandridae is a family of salamanders consisting of true salamanders and newts. Salamandrids are distinguished from other salamanders by the lack of rib or costal grooves along the sides of their bodies and by their rough skin. Their skin i ...

(newts) * Black-spotted newt (''Notophthalmus meridionalis'') Family Plethodontidae (lungless salamanders) * Inyo Mountains salamander (''Batrachoseps campi'') * Kings River slender salamander (''Batrachoseps regius'') * Kern Canyon slender salamander (''Batrachoseps simatus'') * Tehachapi slender salamander (''Batrachoseps stebbinsi'') * Oregon slender salamander (''Batrachoseps wrightorum'') *

Red Hills salamander The Red Hills salamander (''Phaeognathus hubrichti'') is a fairly large, terrestrial salamander growing to about . Its body color is gray to brownish without markings, and its limbs are relatively short. It is the official state amphibian of Alab ...

(''Phaeognathus hubrichti'') * Peaks of Otter salamander (''Plethodon hubrichti'') * Shenandoah salamander (''Plethodon shenandoah'') * Weller's salamander (''Plethodon welleri'') * Pigeon Mountain salamander (''Plethodon petraeus'') * Blue Ridge gray-cheeked salamander (''Plethodon amplus'') * Scott Bar salamander (''Plethodon asupak'') * Cheoah Bald salamander (''Plethodon cheoah'') * Fourche Mountain salamander (''Plethodon fourchensis'') * South Mountain gray-cheeked salamander (''Plethodon meridianus'') * Big Levels salamander (''Plethodon sherando'') * Red-legged salamander (''Plethodon shermani'') *

Siskiyou Mountains salamander The Siskiyou Mountains salamander (''Plethodon stormi''), also called the Siskiyou Mountain salamander, exists only in isolated locations along the Klamath River in northern California and southern Oregon. It is a close relative of the Del Norte ...

(''Plethodon stormi'') * Limestone salamander (''Hydromantes brunus'') * Shasta salamander (''Hydromantes shastae'') * Berry Cave salamander (''Gyrinophilus gulolineatus'') * West Virginia spring salamander (''Gyrinophilus subterraneus'') * Tennessee cave salamander (''Gyrinophilus palleucus'') * Salado Springs salamander (''Eurycea chisholmensis'') * Junaluska salamander (''Eurycea junaluska'') * Cascade Caverns salamander (''Eurycea latitans'') * San Marcos salamander (''Eurycea nana'') * Georgetown salamander (''Eurycea naufragia'') *

Texas salamander ''Eurycea neotenes'', also known as the Texas salamander, Bexar County salamander, Edwards Plateau salamander, or Texas neotenic salamander, is a species of entirely aquatic, lungless salamander native to the United States. It is endemic to centr ...

(''Eurycea neotenes'') * Barton Springs salamander (''Eurycea sosorum'') * Jollyville Plateau salamander (''Eurycea tonkawae'') * Comal blind salamander (''Eurycea tridentifera'') * Texas blind salamander (''Eurycea rathbuni'') * Austin blind salamander (''Eurycea waterlooensis'') * Georgia blind salamander (''Haideotriton wallacei'')

Order Anura (frogs)

Family Bufonidae (toads) *

Arroyo toad The arroyo toad (''Anaxyrus californicus'') is a species of true toads in the family Bufonidae, endemic to California (U.S.) and Baja California state (México). It is currently classified as an Endangered species on the IUCN Red List of Threate ...

(''Anaxyrus californicus'') * Yosemite toad (''Anaxyrus canorus'') * Black toad (''Anaxyrus exsul'') * Houston toad (''Anaxyrus houstonensis'') *

Amargosa toad The Amargosa toad (''Anaxyrus nelsoni'') is a species of toad in the family Bufonidae. It was at one time considered to be a subspecies of the western toad. It is threatened by habitat loss and is classified by the IUCN as being "Critically end ...

(''Anaxyrus nelsoni'') Family Ranidae (true frogs) * Chiricahua leopard frog (''Lithobates chiricahuensis'') ** Ramsey Canyon leopard frog (''Lithobates subaquavocalis'') , species not recognized by SSAR * Florida bog frog (''Lithobates okaloosae'') * Relict leopard frog (''Lithobates onca'') * Mississippi gopher frog (''Lithobates sevosus'') * Tarahumara frog (''Lithobates tarahumarae'') * California red-legged frog (''Rana draytonii'') *

Mountain yellow-legged frog The mountain yellow-legged frog (''Rana muscosa''), also known as the southern mountain yellow-legged frog, is a species of true frog endemic to California in the United States. It occurs in the San Jacinto Mountains, San Bernardino Mountains, ...

(''Rana muscosa'') * Oregon spotted frog (''Rana pretiosa'') * Sierra Nevada yellow-legged frog (''Rana sierrae'')

References

{{threatened species .T .T Fauna of the United States by conservation status *

. . Reptiles,United States

Order Crocodilia Crocodilia (or Crocodylia, both ) is an order of mostly large, predatory, semiaquatic reptiles, known as crocodilians. They first appeared 95 million years ago in the Late Cretaceous period (Cenomanian stage) and are the closest livin ... (crocodilians)

Order Testudines Turtles are an order of reptiles known as Testudines, characterized by a special shell developed mainly from their ribs. Modern turtles are divided into two major groups, the Pleurodira (side necked turtles) and Cryptodira (hidden necked t ... (turtles)

Order Squamata Squamata (, Latin ''squamatus'', 'scaly, having scales') is the largest order of reptiles, comprising lizards, snakes, and amphisbaenians (worm lizards), which are collectively known as squamates or scaled reptiles. With over 10,900 species, i ... (scaled reptiles)