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Archosauria

Archosaurs are a group of diapsid amniotes and are broadly classified as reptiles. The living representatives of this group consist of birds and crocodilians. This group also includes all extinct dinosaurs, pterosaurs, and extinct relatives of cr ...

Aristelliger

Aristelliger nelsoni Barbour, 1914 Aristelliger hechti Schwartz & Crombie, 1975 – Caicos gecko, Hechts Caribbean gecko Aristelliger georgeensis Bocourt, 1873 – St. George Island gecko Aristelliger barbouri Noble & Klingel, 1932 – striped Caribbea ...

Arizona toad

The Arizona toad is a species of toad in the family Bufonidae. It is endemic to the southwestern United States, where its natural habitats are temperate lowland forests, rivers and streams, swamps, freshwater marshes, freshwater springs, ponds, o ...

Hynobiidae

The Asiatic salamanders are primitive salamanders found all over Asia, and in European Russia. They are closely related to the giant salamanders, with which they form the suborder Cryptobranchoidea. About half of hynobiids currently described are ...

Atelopus longirostris

Atelopus longirostris is a species of harlequin frog, a member of the family of true toads. It has been recorded only in northern Ecuador. Records from Colombia probably represent different species. As of mid-2017, it is listed as extinct by the ...

Atheris

Atheris is a genus of venomous vipers known as bush vipers. They are found only in tropical subsaharan Africa and many species have isolated and fragmented distributions due to their confinement to rain forests. In an example of convergent evolut ...

Mysticeti

Baleen whales, also known as whalebone whales, form a parvorder of the infraorder Cetacea. They are a widely distributed and diverse parvorder of carnivorous marine mammals. Mysticeti comprise the families Balaenidae, Balaenopteridae, Cetotheriid ...

Baphetidae

Baphetidae is an extinct family of early tetrapods. Baphetids were large labyrinthodont predators of the Late Carboniferous period of Europe. Fragmentary remains from the Early Carboniferous of Canada have been tentatively assigned to the group. ...

Barbados racer

The Barbados racer, also commonly known as the tan ground snake, was a species of colubrid snake that was endemic to Barbados.

Black swamp snake

The black swamp snake is a species of snake in the subfamily Natricinae of the family Colubridae. The species is endemic to the southeastern United States. There are three subspecies, including the nominotypical subspecies.

Blunt-toothed giant hutia

The blunt-toothed giant hutia is an extinct species of giant hutia from Anguilla and Saint Martin that is estimated to have weighed between 50 and 200 kg. It was discovered by Edward Drinker Cope in 1868 in a sample of phosphate sediments mined i ...

Bunocephalus coracoideus

Bunocephalus coracoideus, the guitarrito, is a species of banjo catfish found in the Amazon River basin. It occurs in Bolivia, Brazil, Peru and Uruguay where it is found in ponds and creeks that contain a large quantity of plant debris. Its diet ...

Calloselasma

Common names: Malayan ground pit viper, Malayan pit viper, Malayan ground snake, Malayan moccasin. Calloselasma is a monotypic genus created for a venomous pit viper species, C. rhodostoma, which is endemic to Southeast Asia from Thailand to nort ...

Camarasauridae

Camarasauridae is a family of neosauropod dinosaurs within the clade Macronaria, the sister group to Titanosauriformes. Among sauropods, camarasaurids are small to medium-sized, with relatively short necks. They are visually identifiable by a sho ...

Camarasaurus

Camarasaurus was a genus of quadrupedal, herbivorous dinosaurs. It was the most common of the giant sauropods to be found in North America. Its fossil remains have been found in the Morrison Formation of Colorado and Utah, dating to the Late Jura ...

Canterbury gecko

The Canterbury gecko is a gecko found in the South Island of New Zealand. It is also known by the Maori names Waitaha gecko and Moko-pāpā, and as the Brown gecko. They were earlier placed in a different genus and called Hoplodactylus brunneus bef ...

Captorhinus

Captorhinus is an extinct genus of captorhinid reptiles that lived during the Permian period. Its remains are known from Oklahoma, Texas, Europe, India, the Pedra de Fogo Formation, Parnaiba Basin, Brazil and the Madumabisa Mudstone, Zambia.

Champsosaurus

Champsosaurus is an extinct genus of diapsid reptiles belonging to the order Choristodera, that existed in the Late Cretaceous and Paleogene periods. It consists of seven species: C. albertensis, C. ambulator, C. gigas, C. laramiensis, C. lindoei ...

Choristodera

Choristodera is an extinct order of semiaquatic diapsid reptiles that ranged from the Middle Jurassic, or possibly Late Triassic, to at least the early Miocene. It was named by Edward Drinker Cope in 1884. Choristoderes have been found in North A ...

Clepsydrops

Clepsydrops is an extinct genus of primitive synapsids from the early Late Carboniferous that was related to Archaeothyris. The name means hour-glass appearance. Synapsida is the group or clade that includes mammals, but the term is mainly used t ...

Clidastes

Clidastes is an extinct genus of marine lizard belonging to the mosasaur family. It is classified as part of the Mosasaurinae subfamily, alongside genera like Mosasaurus and Prognathodon. Clidastes is known from deposits ranging in age from the C ...

Coelophysis

Coelophysis is an extinct genus of coelophysid theropod dinosaur that lived approximately 216 to 196 million years ago during the latter part of the Triassic Period in what is now the southwestern United States and also in South Africa and Zimbab ...

Colostethus

Colostethus is a genus of poison dart frogs native to Central and South America, from Panama south to Colombia, Ecuador, and northern Peru. Their common name is rocket frogs, but this name may refer to frogs in other genera and families, followin ...

Colostethus inguinalis

Colostethus inguinalis is a species of frog in the family Dendrobatidae. It is endemic to northwestern and northcentral Colombia. Its vernacular name is common rocket frog, although this name can also refer to Colostethus panamansis that until 20 ...

Colostethus latinasus

Colostethus latinasus is a species of frog in the family Dendrobatidae. It is known from Cerro Pirre in Darien Province, Panama, from Choco Department in adjacent Colombia, and from Tierralta, Cordoba Department, Colombia.

Colosteus

Colosteus is an extinct genus of colosteid tetrapod from the Late Carboniferous of Ohio. Its remains have been found at the Linton site in Saline Township, Ohio, where it is one of the most common tetrapods, and at the Five Points site in Mahonin ...

Common ameiva

There are fifteen accepted subspecies in The Reptile Database. Given the variation among the subspecies, some authors suggest that they probably comprise more than one species. Pholidoscelis chrysolaemus alacri Schwartz & Klinikowski 1966 Pholido ...

Common Puerto Rican ameiva

In addition to the nominotypical subspecies Ameiva exsul Cope, 1862 two other subspecies are recognized as being valid. Isla Mona has a smaller subspecies Pholidoscelis exsul alboguttata Boulenger, 1896, whereas Isla Desecheo has a larger subspec ...

Cophylinae

Cophylinae is a subfamily of microhylid frogs endemic to Madagascar. It has over 100 species in eight genera. Members of this subfamily range from minute to fairly large, and they are highly ecologically diverse. DNA barcode research has revealed ...

Corallus ruschenbergerii

Common names: Central American tree boa, common tree boa, Trinidad tree boa. Corallus ruschenbergerii is a nonvenomous boa species endemic to lower Central America and northern South America. No subspecies are currently recognized.

Craugastor ranoides

Craugastor ranoides is a species of frog in the family Craugastoridae. It is found in the southern Atlantic lowland of Nicaragua and northwestern Costa Rica, and through Costa Rica to extreme western Panama. Its natural habitats are, principally, ...

Crossopholis

Crossopholis was a bony fish that lived in the lower Eocene approximately 52 million years ago. It is an extinct relative of the contemporary paddlefish.

Crotalus basiliscus

Common names: Mexican west coast rattlesnake, Mexican green rattler, more Crotalus basiliscus is a venomous pit viper species in the family Viperidae. The species is endemic to western Mexico. The specific name, basiliscus, is derived from the Gr ...

Crotalus enyo

Common names: Baja California rattlesnake, Lower California rattlesnake Crotalus enyo is a venomous pit viper species native to the coast and islands of northwestern Mexico. Three subspecies are currently recognized, including the nominate subspe ...

Crotalus mitchellii

Common names: speckled rattlesnake, Mitchells rattlesnake, white rattlesnake Crotalus mitchellii is a venomous pit viper species in the family Viperidae. The species is endemic to the Southwestern United States and adjacent northern Mexico. The s ...

Crotalus polystictus

The Mexican lance-headed rattlesnake or lance-headed rattlesnake is a venomous pit viper species found in central Mexico. No subspecies is currently recognized.

Crymocetus

Crymocetus is an extinct genus of plesiosaur from the Cretaceous Chalk Group of Sussex, England. Since its description, it has been seldom examined by subsequent authors, except when mentioned in discussions of Cretaceous plesiosaurs

Cryptodira

The Cryptodira are a suborder of Testudines that includes most living tortoises and turtles. Cryptodira differ from Pleurodira in that they lower their necks and pull the heads straight back into the shells, instead of folding their necks sideway ...

Cui-ui

The cui-ui is a large sucker fish endemic to Pyramid Lake and, prior to its desiccation in the 20th century, Winnemucca Lake in northwestern Nevada. It feeds primarily on zooplankton and possibly on nanoplankton. The maximum size of male cui-ui i ...

Daeodon

Daeodon is an extinct genus of entelodont artiodactyl that inhabited North America between 29 and 19 million years ago during the middle Oligocene and early Miocene epochs. The type species is Daeodon shoshonensis, the last and largest of the ent ...

Dendropsophus microcephalus

Dendropsophus microcephalus is a species of frog in the family Hylidae. It is found in southeastern Mexico, Central America, and northern South America in Colombia, Venezuela, Trinidad and Tobago, the Guianas, and northern Brazil. This widespread ...

Dianema

Dianema is a small genus of freshwater catfish in the Callichthyinae subfamily of the armored catfish family. The type species for this genus is Dianema longibarbis. The name is derived from the Greek di, meaning "two", and nema, meaning "filamen ...

Diasporus diastema

Diasporus diastema is a species of frog in the family Eleutherodactylidae. Common names include common tink frog or dink frog, supposedly because of the loud metallic "tink" sound that the male frog makes during the night. It is found in Central ...

Dimetrodon

Dimetrodon or, meaning "two measures of teeth") is an extinct genus of non-mammalian synapsids that lived during the Cisuralian, around 295–272 million years ago. It is a member of the family Sphenacodontidae. The most prominent feature of Dimetr ...

Diplocaulus

Diplocaulus is an extinct genus of lepospondyl amphibians which lived from the Late Carboniferous to Permian periods of North America and Africa. Diplocaulus are by far the largest and most well-known of the lepospondyls, characterized by a disti ...

Dissorophus multicinctus

Dissorophus is an extinct genus of temnospondyl amphibian that lived during the Early Permian Period about 273 million years ago. Its fossils have been found in Texas and in Oklahoma in North America. Its heavy armor and robust build indicate Dis ...

Osteolaemus

The dwarf crocodile, also known as the African dwarf crocodile, broad-snouted crocodile or bony crocodile, is an African crocodile that is also the smallest extant species of crocodile. Sampling has identified three genetically distinct populatio ...

Dystrophaeus

Dystrophaeus is the name given to an extinct genus of eusauropod dinosaur from the early Kimmeridgian stage of the Late Jurassic that existed around 154.8 Ma. Its fossils were found in the Tidwell Member of the Morrison Formation of Utah. Its est ...

Edaphosauridae

Edaphosauridae is a family of mostly large Late Carboniferous to Early Permian synapsids. Edaphosaur fossils are so far known only from North America and Europe.

Edaphosaurus

Edaphosaurus is a genus of extinct edaphosaurid synapsid that lived in what is now North America and Europe around 303.4 to 272.5 million years ago, during the late Carboniferous to early Permian periods. The American paleontologist Edward Drinke ...