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Platecarpus

Platecarpus is an extinct genus of aquatic lizards belonging to the mosasaur family, living around 84–81 million years ago during the middle Santonian to early Campanian, of the Late Cretaceous period. Fossils have been found in the United States ...

Pleurodira

The Pleurodira are one of the two living suborders of turtles, the other being the Cryptodira. The division between these two suborders represents a very deep evolutionary divide between two very different types of turtles. The physical differenc ...

Pneumatoarthrus

Pneumatoarthrus is an extinct genus of sea turtle known from the Late Cretaceous Mount Laurel Formation of Monmouth County, New Jersey.

Podocnemididae

Podocnemididae is a family of pleurodire turtles native to Madagascar and northern South America. Podocnemidid turtles are commonly called "side-necked turtles" in direct reference to their inability to retract their heads backwards, but hide the ...

Poison dart frog

Poison dart frog is the common name of a group of frogs in the family Dendrobatidae which are native to tropical Central and South America. These species are diurnal and often have brightly colored bodies. This bright coloration is correlated wit ...

Polycotylus

Polycotylus is a genus of plesiosaur within the family Polycotylidae. The type species is P. latippinis and was named by American paleontologist Edward Drinker Cope in 1869. Eleven other species have been identified. The name means much-cupped ve ...

Porthidium

Common names: hognose pitvipers. Porthidium is a genus of venomous pitvipers found in Mexico and southward to northern South America. The name is derived from the Greek word portheo and the suffix -idus, which mean "destroy" and "having the natur ...

Protostega

Protostega is an extinct genus of sea turtle containing a single species, Protostega gigas. Its fossil remains have been found in the Smoky Hill Chalk formation of western Kansas and time-equivalent beds of the Mooreville Chalk Formation of Alaba ...

Protostegidae

Protostegidae is a family of extinct marine turtles that lived during the Cretaceous period. The family includes some of the largest sea turtles that ever existed. The largest, Archelon, had a head one metre long. Like most sea turtles, they had ...

Ptilodontidae

Ptilodontidae is a family of primitive mammals within the extinct order Multituberculata. Representatives are known from the Upper Cretaceous and Paleocene of North America. The Ptilodontidae family was originally named Ptilodontinae and classifi ...

Ptilodus

Ptilodus is a genus of mammals from the extinct order of Multituberculata, and lived during the Paleocene in North America. Ptilodus was a relatively large multituberculate of 30 to 50 centimetres 12 to 20 in length, which is about the same size ...

Puppigerus

Puppigerus is an extinct genus of sea turtle from the Eocene. It is known from finds in the United States, the United Kingdom, Belgium, Denmark, and Uzbekistan.

Osmerus spectrum

The pygmy smelt is a North-American freshwater fish in the family Osmeridae. It is found in a number of deep, thermally stratified lakes in eastern Canada and New England. The pygmy smelt coexists with the rainbow smelt Osmerus mordax, and is dis ...

Pythonomorpha

Pythonomorpha was originally proposed by paleontologist Edward Drinker Cope as a reptilian order comprising mosasaurs, which he believed to be close relatives of Ophidia. The etymology of the term Pythonomorpha comes from the Greek Python and mor ...

Rhadinaea

The following 22 species are recognized as being valid. Rhadinaea omiltemana Gunther, 1894 Rhadinaea macdougalli H.M. Smith & Langebartel, 1949 Rhadinaea taeniata W. Peters, 1863 Rhadinaea marcellae Taylor, 1949 Rhadinaea montana H.M. Smith, 1944 ...

Rhineura

Rhineura floridana, known commonly as the North American worm lizard, Florida worm lizard, graveyard snake, or thunderworm, is a species of amphisbaeninan in the family Rhineuridae. The species is the only member of the monotypic genus Rhineura, ...

Saint Croix ground lizard

Growing to a size of between 35 and 90 mm excluding the tail, adults have a pattern of light brown, dark brown and white longitudinal stripes down their back. Below these are a series of narrow brown, black and white vertical stripes, which exten ...

Sceloporus jarrovii

Sceloporus jarrovii, commonly known as the Yarrows spiny lizard, is a species of phrynosomatid lizard native to the Arizona, United States and northern Mexico.

Scinax elaeochroa

Scinax elaeochroa, commonly known as the Sipurio snouted treefrog, or olive snouted treefrog, is a species of frog in the family Hylidae. It is found in the Caribbean lowlands of Nicaragua and Panama and in the Pacific lowlands of Costa Rica and ...

Scolecophidia

The Scolecophidia, commonly known as blind snakes or thread snakes, are an infraorder of snakes. They range in length from 10 to 100 cm. All are fossorial. Five families and 39 genera are recognized. The Scolecophidia infraorder is almost likely ...

Sibon sanniolus

Sibon sanniolus, commonly known as the pygmy snail-eating snake or the pygmy snail sucker, is a species of small snake in the family Colubridae. The species is endemic to Central America and southeastern Mexico.

Siphateles

The species include: Siphateles alvordensis C. L. Hubbs & R. R. Miller, 1972 Alvord chub Siphateles bicolor mohavensis Snyder, 1918 Mohave tui chub Siphateles bicolor Girard, 1856 Tui chub Siphateles bicolor pectinifer Snyder, 1917 Siphateles bic ...

Sombrero ameiva

The Sombrero ameiva is a lizard species in the genus Ameiva. It is endemic to Sombrero, a small, uninhabited island in the Lesser Antilles under the jurisdiction of Anguilla.

Spea

Spea is a genus of North American amphibian commonly referred to as the western spadefoot toads. They differ greatly from true toads by having eyes with vertical pupils, no parotoid glands, and relatively smooth skin. Their most distinctive featu ...

Sphaenorhynchus carneus

Sphaenorhynchus carneus, the Napo lime treefrog, is a species of frog in the family Hylidae. It is found in the upper Amazon Basin in southern Colombia, Ecuador, Peru and in central Amazonia in Brazil. It might also occur in Bolivia. Sphaenorhync ...

Staurois

Staurois is a small genus of minuscule true frogs. Most species in the genus are restricted to Borneo, but two species are from the Philippines. This genus is a quite ancient member of the true frog family, Ranidae. They are typically found in or ...

Stegops

Stegops is an extinct genus of euskelian temnospondyl from the Late Carboniferous of the eastern United States. Fossils are known from the Pennsylvanian coal deposits of Linton, Ohio. It was once classified in the eryopoid family Zatrachydidae be ...

Stereocyclops

Stereocyclops is a small genus of microhylid frogs. It is endemic to the Atlantic forest of eastern Brazil. Molecular phylogeny suggests that it is sister taxon to the clade containing Dasypops and Myersiella.

Stereocyclops incrassatus

Stereocyclops incrassatus is a species of frog in the family Microhylidae. It is endemic to eastern Brazil and is known from Pernambuco and Alagoas in the north and then southward through Bahia to Minas Gerais and Espirito Santo. Earlier records ...

Stereosternum

Stereosternum tumidum is an extinct genus of mesosaur marine reptile from the Early Permian of Brazil and also the Great Karoo Basin of South Africa. The taxon mesosaur is a monophyletic group containing Brazilosaurus sanpauloensis and Mesosaurus ...

Stygobromus

Stygobromus is a genus of amphipod crustaceans that live in subterranean habitats. As well as a large number of species in North America, a smaller number of species are also known from Eurasia. Most of the North American species live in areas wh ...

Texas lyre snake

The Texas lyre snake is a species of mildly venomous rear-fanged snake in the family Colubridae. The species is endemic to the southwestern United States and adjacent northern Mexico.

Thecachampsa

Thecachampsa is an extinct genus of tomistomine crocodylian. Fossils have been found from the eastern United States in deposits of late Oliogcene to Miocene age. Those named in the 19th century were distinguished primarily by the shape of their t ...

Thorius

Thorius, also known as minute salamanders, pigmy salamanders, or Mexican pigmy salamanders, is a genus of salamanders in the family Plethodontidae. They are endemic to Mexico and found in southern Veracruz and Puebla to Guerrero and Oaxaca. Thori ...

Thoropa

Thoropa is a genus of frogs in the family Cycloramphidae. They are endemic to eastern and southeastern Brazil. They are sometimes known as river frogs.

Tomarctus

Tomarctus is a canid genus of the extinct subfamily Borophaginae which inhabited most of North America during the late Early Miocene to the Early Barstovian age of the Middle Miocene. Tomarctus existed for approximately 6.83 million years. This a ...

Toxochelys

Toxochelys is an extinct genus of marine turtle from the Late Cretaceous period. It is the most commonly found fossilized turtle species in the Smoky Hill Chalk, in western Kansas.

Trimerorhachis

Trimerorhachis is an extinct genus of dvinosaurian temnospondyl within the family Trimerorhachidae. It is known from the Early Permian of the southwestern United States, with most fossil specimens having been found in the Texas Red Beds. The type ...

Trimetopon

Trimetopon is a genus of colubrid snakes, which are native to Costa Rica and Panama. Species in the genus Trimetopon are known commonly as tropical ground snakes.

Trimorphodon

Trimorphodon is a genus of mildly venomous, rear-fanged, colubrid snakes. They are commonly known as lyre snakes, named after the distinctive V shaped pattern on their head that is said to resemble the shape of a lyre. In Mexico, they are commonl ...

Triprion

Triprion is a genus of frogs in the family Hylidae found in the Pacific lowlands of Mexico, the Yucatan Peninsula, and Guatemala. These frogs hide in tree-holes and plug the entrance with their strange-looking, bony heads.

Tropidoclonion

Tropidoclonion is a genus of snake in the subfamily Natricinae of the family Colubridae. The genus is monotypic, containing the sole species Tropidoclonion lineatum, commonly known as the lined snake. The species is endemic to North America.

Tungara frog

The tungara frog is a species of frog in the family Leptodactylidae. Its local Spanish name is sapito de pustulas. It is found in Belize, Colombia, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama, Trinidad and Tobago, Vene ...

Urosaurus nigricaudus

Urosaurus nigricaudus is a species of lizard. Common names for this species include the Baja California brush lizard, black-tailed brush lizard, and small-scaled tree lizard. Its range includes southern California, Baja California, and nearby Pac ...

Xenarthra

Xenarthra is a major clade of placental mammals unique to the Americas. It currently consists of 31 living species, the anteaters, tree sloths, and armadillos. Extinct xenarthrans are the paleotheres, the glyptodonts, and the ground sloths. Xenar ...

Xenosauridae

Xenosauridae is a family of anguimorph lizards whose only living representative is the genus Xenosaurus, which is native to Central America. Xenosauridae also includes the extinct genera Exostinus and Restes. Also known as knob-scaled lizards, th ...

Yellow-striped pygmy eleuth

The yellow-striped pygmy eleuth, also known as the yellow-striped dwarf frog, is a species of frog in the Eleutherodactylidae family from closed mesic and xeric forests in Cuba. The yellow-striped pygmy eleuth is relatively brightly marked in ora ...

Zapsalis

Zapsalis is a genus of dromaeosaurine theropod dinosaurs. It is a tooth taxon, often considered dubious because of the fragmentary nature of the fossils, which include teeth but no other remains. The type species is Zapsalis abradens, from the Ju ...

Zatrachys

Zatrachys was named by American paleontologist Edward Drinker Cope in 1878 for the type species, Z. serratus, based on a partial skull from the early Permian of Texas. Additional material has been reported from the early Permian of New Mexico and ...

Zygaspis

Zygaspis is a genus of lizards in the family Amphisbaenidae. Species in the genus are commonly known as purple round-headed worm lizards, and are native to equatorial and southern Africa.