Crocodyliformes

Crocodyliformes is a clade of crurotarsan archosaurs, the group often traditionally referred to as "crocodilians". They are the first members of Crocodylomorpha to possess many of the features that define later relatives. They are the only pseudosuchians to survive the K-Pg extinction event.

Mesoeucrocodylia is the clade that includes Eusuchia and crocodyliforms formerly placed in the paraphyletic group Mesosuchia. The group appeared during the Early Jurassic, and continues to the present day.

Protosuchus (from , "first" and , "crocodile") is an extinct genus of carnivorous crocodyliform from the Early Jurassic. It is among the earliest animals that resemble crocodilians. Protosuchus was about in length thumb|left|The skull of Protosuchus richardsoni (AMNH 3024) thumb|left|The pelvis and hindlimbs of Protosuchus richardsoni (AMNH 3024) thumb|right|Protosuchus richardsoni fossil AMNH 3024 As an early crocodilian relative, its skull and postcranial anatomy featured more crocodilian characteristics than its earlier ancestors; it had short jaws that broadened out at the base of the skul

Protosuchia is a group of extinct Mesozoic crocodyliforms. They were small in size (~1 meter in length) and terrestrial. In phylogenetic terms, Protosuchia is considered an informal group because it is a grade of basal crocodyliforms, not a true clade.

"Mesosuchia" is an obsolete name for a group of terrestrial, semi-aquatic, or fully aquatic crocodylomorph reptiles.

Hsisosuchus is an extinct genus of crocodyliform from China. Currently there are three species within this genus: H. dashanpuensis is from the Middle Jurassic, while H. chungkingensis and H. chowi are from the Late Jurassic. It is likely to have been a medium-sized (~ long) predator. thumb|left|Skull and [[vertebrae of H. chungkingensis at the Hong Kong Science Museum]] Fossils of H. chungkingensis were found in the Shangshaximiao Formation (near Chongqing city). The holotype consists of the cranial skeleton and caudal osteoderms. A more complete specimen was found and des

Gobiosuchus ("Gobi [desert] crocodile") is an extinct genus of crocodyliform described in 1972 by Polish palaeontologist Halszka Osmólska. It hails from the Late Cretaceous (Early Campanian) of Bayn Dzak (Djadokhta Formation), in the Gobi Desert of Mongolia. The type species is Gobiosuchus kielanae, classified as a member of the family Gobiosuchidae.

Sichuanosuchus is an extinct genus of crocodyliform from the Late Jurassic and possibly Early Cretaceous of China.

Kemkemia is a genus of probable crocodyliforms living in the Cretaceous, described from a single fossil that was recovered in 1999 from Morocco by an Italian team searching for fossil invertebrates. The fossil of Kemkemia dates from the Cenomanian age.

Metasuchia is a major clade within the superorder Crocodylomorpha. It is split into two main groups, Notosuchia and Neosuchia. Notosuchia is an extinct group that contains primarily small-bodied Cretaceous taxa with heterodont dentition. Neosuchia includes the extant crocodylians and basal taxa, such as peirosaurids and pholidosaurids. It is phylogenetically defined by Sereno et al. (2001) as a clade containing Notosuchus terrestris, Crocodylus niloticus, and all descendants of their common ancestor.

Zaraasuchus ("hedgehog crocodile") is a gobiosuchid crocodyliform described in 2004 by Diego Pol and Mark Norell. It was found in the Red Beds of Zos Canyon, in the Gobi Desert of Mongolia, thus making it Late Cretaceous in age.

Edentosuchus is a genus of protosuchian crocodyliform. It is known from fossils found in rocks of the Early Cretaceous-age Tugulu Group from the Junggar Basin, Xinjiang, China. Two partial skulls and several neck vertebrae are known to date. An articulated partial postcranial skeleton may also belong to this genus, but there is no overlapping material between it and known Edentosuchus specimens.

Sabresuchus is an extinct genus of neosuchian crocodyliform from the Cretaceous of Europe. The name is derived from 'Sabre' in reference to the enlarged and curved fifth maxillary tooth, and 'suchus' from the Ancient Greek for crocodile.

Gobiosuchidae is a family of Cretaceous crocodyliforms known from Mongolia and Spain.

Neuquensuchus (meaning "Neuquén crocodile", referring to the city) is an extinct genus of crocodyliform from the Santonian-age Upper Cretaceous Bajo de la Carpa Formation of Neuquén Province, Argentina. The known remains were discovered on the campus of Universidad Nacional del Comahue in the city of Neuquén. Neuquensuchus was named by Lucas E. Fiorelli and Jorge O. Calvo in a publication dated to 2007, but which became available in 2008. The type species is N. universitas, in recognition of its discovery locality. Unlike the great majority of crocodyliforms, its shin was longer than its thigh

Protosuchidae is a family of basal crocodyliform reptiles that lived from the Late Triassic to the Late Cretaceous. This family should not be confused with Protosuchia, which is an informal evolutionary grade of primitive crocodyliforms

Orthosuchus (meaning "straight crocodile") is an extinct genus of crocodyliform that lived during the Early Jurassic, about 196 million years ago. It was first discovered in 1963 in the Red Beds Formation in the Qacha's Nek Province of Lesotho, southern Africa. The characteristics showed on its postcranial skeleton and the skull indicated that it is a crocodyliform. The finding is significant since some of the characteristics found on this specimen were believed to be absent until Jurassic.

Fruitachampsa is a genus of shartegosuchid crocodyliform from the Upper Jurassic Morrison Formation of Colorado. It is known from multiple specimens that show it to have been a relatively long-limbed terrestrial quadrupedal predator less than long, with a short face and a prominent pair of canine-like teeth in the lower jaw. Before it was formally described in 2011, it was also known as the "Fruita form". Its type species is F. callisoni.

Zosuchus ("Zos [Canyon] crocodile") is a genus of basal, Late Cretaceous crocodyliform from Mongolia.

Dianchungosaurus (meaning "Dianchung lizard") is an extinct genus of mesoeucrocodylian crocodyliform from the Early Jurassic of China. It was previously considered a dinosaur, but it was recently reclassified as a mesoeucrocodylian by Paul Barrett and Xing Xu (2005). It is probably the same animal as the informally named "Tianchungosaurus". The type species is D. lufengensis and it was described in 1982. A second species, D. elegans, was named in 1986, but it has since become a synonym of the type species.

Stolokrosuchus is an extinct genus of crocodyliforms found in the Early Cretaceous Elrhaz Formation, Niger. It is known from a nearly complete skull displaying a narrow, highly elongated and tubular snout similar to modern gharials. The classification of Stolokrosuchus has been a matter of debate, it was originally considered to be a member of the family Peirosauridae, but later studies also recovered it as possibly closely related to mahajangasuchids or more recently as a member of the family Itasuchidae. While all of these placements would classify Stolokrosuchus as a notosuchian, other stud

Hemiprotosuchus is an extinct genus of protosuchid crocodyliform from the Late Triassic (Norian stage) Los Colorados Formation of the Ischigualasto-Villa Unión Basin in northwestern Argentina, South America. It was named in 1969 by paleontologist José Bonaparte . The type species is H. leali.