Reptile genera

An alligator, or colloquially gator, is a large reptile in the genus Alligator of the family Alligatoridae in the order Crocodilia. The two extant species are the American alligator (A. mississippiensis) and the Chinese alligator (A. sinensis). Additionally, several extinct species of alligator are known from fossil remains. Alligators first appeared during the late Eocene epoch about 37 million years ago.

Crocodylus is a genus of true crocodiles in the family Crocodylidae.

genus of crocodilians from the alligator family

Paleosuchus (from Ancient Greek παλαιός (palaiós), meaning "old", and Σοῦχος (Soûkhos), meaning "Sobek") is a South American genus of reptiles in the subfamily Caimaninae of the family Alligatoridae. They are the smallest members of the order Crocodilia in the Americas.

Lagosuchus is an extinct genus of avemetatarsalian archosaur from the Late Triassic of Argentina. The type species of Lagosuchus, Lagosuchus talampayensis, is based on a small partial skeleton recovered from the early Carnian-age Chañares Formation. The holotype skeleton of L. talampayensis is fairly fragmentary, but it does possess some traits suggesting that Lagosuchus was a probable dinosauriform, closely related to dinosaurs.

Saltopus ("hopping foot") is a genus of very small bipedal dinosauriform containing the single species Saltopus elginensis from the late Triassic period of Scotland. It is one of the most famous Elgin Reptiles.

Chuckwallas are lizards found primarily in arid regions of the southwestern United States and northern Mexico. Some are found on coastal islands. The five species of chuckwallas are all placed within the genus Sauromalus; they are part of the iguanid family, Iguanidae.

thumb|upright|A skull of the extinct Gavialis species G. bengawanicus, which lived in the Pleistocene

Nyasasaurus (meaning "Lake Nyasa lizard") is an extinct genus of avemetatarsalian archosaur from the putatively Middle Triassic Manda Formation of Tanzania that may be the earliest known dinosaur. The type species Nyasasaurus parringtoni was first described in 1956 in the doctoral thesis of English paleontologist Alan J. Charig, but it was not formally described until 2013.

Marasuchus (meaning "Mara crocodile") is an early genus of dinosauriform archosaur, one of the closest relatives of dinosaurs. It is sometimes regarded as a junior synonym of Lagosuchus (which would make Marasuchus an invalid later name for Lagosuchus fossils). Both names have been applied to small bipedal dinosauriform fossils from the same time and place: the Late Triassic (early Carnian stage) of what is now La Rioja Province, Argentina. If valid, Marasuchus contains a single species, Marasuchus lilloensis.

Eurydactylodes is a small genus of geckos commonly referred to as chameleon geckos from the subfamily Diplodactylidae, endemic to New Caledonia and few adjacent islands. Within the Diplodactylidae, Eurydactylodes resides in the Carphodactylini tribe, and consists of four species. All species share similar morphology as well as lifestyle and habits. The first of the Eurydactylodes species to be classified, E. vieillardi, was discovered in 1869.

Silesaurus is a genus of silesaurid dinosauriform from the Late Triassic, of what is now Poland.

Asilisaurus ( ); from Swahili, asili ("ancestor" or "foundation"), and Greek, (, "lizard") is an extinct genus of silesaurid archosaur. The type species is Asilisaurus kongwe. Asilisaurus fossils were uncovered in the Manda Beds of Tanzania, a formation typically dated to the Anisian stage of the Middle Triassic; however, some authors assert that the formation may be Ladinian or early Carnian instead. If it truly is Anisian, Asilisaurus would be one of the oldest known members of the Avemetatarsalia (animals on the dinosaur/pterosaur side of the archosaurian family tree). Asilisaurus was the f

Mecistops is a genus of crocodiles, the slender-snouted crocodiles, native to sub-Saharan Africa.

Osteolaemus (from Ancient Greek όστεον (ósteon), meaning "bone", and λαιμός (laimós), meaning "throat") is a genus of crocodiles. They are small, secretive crocodiles that occur in wetlands of West and Middle Africa. They are commonly known as the African dwarf crocodiles. Unlike other crocodiles, Osteolaemus are strictly nocturnal.

Tomistoma is a genus of gavialid crocodilians. They are noted for their long narrow snouts used to catch fish, similar to the gharial. Tomistoma contains one extant (living) member, the false gharial (Tomistoma schlegelii), as well as potentially several extinct species: T. cairense, T. lusitanicum and T. coppensi. Previously assigned extinct species known from fossils are reclassified as different genera such as Eogavialis, Toyotamaphimeia and Sutekhsuchus.

Melanosuchus, from Ancient Greek μέλας (mélas), meaning "black", and σούχος (soúkhos), meaning "crocodile", is a genus of caiman. The genus is most commonly referred to as the "Black Caimans". The black caiman of South America is the sole extant (living) species, and is the largest living member of the subfamily Caimaninae, as well as the entire alligator family Alligatoridae.

Sacisaurus ("Saci lizard") is a silesaurid dinosauriform from the Late Triassic (Norian) Caturrita Formation of southern Brazil. The scientific name, Sacisaurus agudoensis, refers to the city where the species was found, Agudo in the Rio Grande do Sul state, whereas Sacisaurus refers to Saci, a famous one-legged creature from Brazilian mythology, because among the dozens of fossil material unearthed, 35 right femora were collected whereas only 1 left femur was found.

Eucoelophysis (meaning "true hollow form") is a genus of silesaurid dinosauriform from the Late Triassic (Norian) period Chinle Formation of New Mexico. It was assumed to be a coelophysid upon description, but a study by Nesbitt et al. found that it was actually a close relative of Silesaurus, which was independently supported by Ezcurra (2016), who found it to be the sister group to Dinosauria, and Silesaurus as the next most basal taxon.

Technosaurus (meaning "Tech lizard", for Texas Tech University) is an extinct genus of silesaurid dinosauriforms, from the Late Triassic Cooper Canyon Formation (Dockum Group) of Texas, United States.

Lewisuchus is a genus of archosaur that lived during the Late Triassic (early Carnian). As a silesaurid dinosauriform, it was a member of the group of reptiles most commonly considered to be the closest relatives of dinosaurs (possibly true dinosaurs themselves). Lewisuchus was about long. Fossils have been found in the Chañares Formation of Argentina. It exhibited osteoderms along its back.

Lapitiguana impensa is an extinct giant (1.5 m long) iguanid from Fiji. It likely became extinct following the human colonization of Fiji 3000 years ago.

Kwanasaurus is an extinct genus of silesaurid dinosauromorph reptiles from the Late Triassic of Colorado. It is known from a single species, Kwanasaurus williamparkeri. Kwanasaurus had a deeper, stronger skull and greater specialization for herbivory compared to other silesaurids. It also possessed many unique characteristics of the snout, ilium, and lower part of the femur. It was described along with new specimens of Dromomeron from the Eagle Basin, the northernmost extent of the Chinle Formation.