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Alligator Olseni
''Alligator olseni'' (common name Olsen's Alligator, named after Russel Olsen) is an extinct species of alligator. They lived in the Early Miocene period, around 20.4–15.97 million years ago and possibly earlier. Their range was principally in what is now known as Florida, United States, and possibly extending into southeastern Texas. It is a small alligator with an estimated body length of . Classification ''Alligator olseni'' is a member of the subfamily Alligatorinae, within the larger family Alligatoridae. It is closely related to the living American alligator and Chinese alligator, as shown in the cladogram A cladogram (from Greek language, Greek ''clados'' "branch" and ''gramma'' "character") is a diagram used in cladistics to show relations among organisms. A cladogram is not, however, an Phylogenetic tree, evolutionary tree because it does not s ... below: References olseni Miocene reptiles of North America Fossil taxa described in 1942 {{paleo-ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Miocene
The Early Miocene (also known as Lower Miocene) is a sub-epoch of the Miocene epoch (geology), Epoch made up of two faunal stage, stages: the Aquitanian age, Aquitanian and Burdigalian stages. The sub-epoch lasted from 23.03 ± 0.05 annum, Ma to 15.97 ± 0.05 Ma (million years ago). It was preceded by the Oligocene epoch. As the climate started to get cooler, the landscape started to change. New mammals evolved to replace the extinct animals of the Oligocene epoch. The first members of the hyena and weasel family started to evolve to replace the extinct ''Hyaenodon'', entelodonts and bear-dogs. The chalicotheres survived the Oligocene epoch. A new genus of entelodont called ''Daeodon'' evolved in order to adapt to the new habitats and hunt the new prey animals of the Early Miocene epoch; it quickly became the top predator of North America. But it became extinct due to competition from ''Amphicyon'', a newcomer from Eurasia. ''Amphicyon'' bested ''Daeodon'' because the bear-dog's la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caimaninae
A caiman ( (also spelled cayman) from Taíno ''kaiman'') is an alligatorid belonging to the subfamily Caimaninae, one of two primary lineages within the Alligatoridae family, the other being alligators. Caimans are native to Central and South America and inhabit marshes, swamps, lakes, and mangrove rivers. They have scaly skin and live a fairly nocturnal existence. They are relatively small-sized crocodilians with an average maximum weight of depending on species, with the exception of the black caiman (''Melanosuchus niger''), which can grow more than in length and weigh in excess of 450 kg (1,000 Ib). The black caiman is the largest caiman species in the world and is found in the slow-moving rivers and lakes that surround the Amazon basin. The smallest species is the Cuvier's dwarf caiman (''Paleosuchus palpebrosus''), which grows to long. There are six different species of caiman found throughout the watery jungle habitats of Central and Southern America. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alligator Mefferdi
''Alligator mefferdi'' is an extinct species of alligator described by Charles Craig Mook. They lived in the Miocene period, and their range was principally in what is now Nebraska, United States. Fossilworks The was discovered in the at Ash Hollow State Historical Park. Classification ''A. mefferdi'' is a member of the |
Alligator Thomsoni
''Alligator thomsoni'' is an extinct species of alligator that existed during the Early Miocene period. Their range was principally in what is now known as Nebraska, United States.“Alligator Thomsoni Mook 1923 (Alligator).” FossilworksFossilworks“Alligator Thomsoni Mook, 1923.” GBIFwww.gbif.org/species/4967707 Classification ''Alligator thomsoni'' is a member of the subfamily Alligatorinae, within the larger family Alligatoridae. It is closely related to the living American alligator, as shown in the cladogram below: Measurements The average measurement for the skull of a ''A. thomsoni'' is 363.0 x 223.0 in millimeters. Based on the length, the estimated body mass Mass is an Intrinsic and extrinsic properties, intrinsic property of a physical body, body. It was traditionally believed to be related to the physical quantity, quantity of matter in a body, until the discovery of the atom and particle physi ... 67.8 kg. References thomsoni Miocene repti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alligator Mcgrewi
''Alligator mcgrewi'' is an extinct species of alligator described by K.P. Schmidt in 1941. They lived in the Early Miocene period, and their range was principally in what is now Nebraska, United States. It is a small alligator with an estimated body length of . ''A. mcgrewi'' has a unique snout, distinguishing it from other alligator species and implying that it evolved from specific environmental adaptations. Classification ''Alligator mcgrewi'' is a member of the subfamily Alligatorinae, within the larger family Alligatoridae. It is related to the living American alligator and Chinese alligator, as shown in the cladogram A cladogram (from Greek language, Greek ''clados'' "branch" and ''gramma'' "character") is a diagram used in cladistics to show relations among organisms. A cladogram is not, however, an Phylogenetic tree, evolutionary tree because it does not s ... below: References mcgrewi Miocene reptiles of North America Fossil taxa described in 1941 Taxa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alligator Prenasalis
''Alligator prenasalis'' is an extinct species of alligator from the Late Eocene period. It is well known, with many fossils having been collected from the Chadron Formation, Chadron and Brule Formations in South Dakota. The species was first named in 1904, but was originally classified as a crocodile in the genus ''Crocodilus''. It was reassigned to the genus ''Alligator'' in 1918 on the basis of more complete material. It is the earliest known member of the genus ''Alligator''. Taxonomy Junior synonyms Several species of extinct Alligatorinae, alligatorines have been considered junior synonyms of ''A. prenasalis''. These include ''Caimanoidea visheri'', named by paleontologist Maurice Mehl in 1916 from fragmentary material, and ''Allognathosuchus riggsi'', named in 1931 from a single piece of a lower jaw. Both were considered synonymous with the species in 1972 by paleontologist D.W. Higgins. Mehl used two alternate spellings of ''Caimanoidea'' in his 1916 paper: ''Caimanoideu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alligator
An alligator, or colloquially gator, is a large reptile in the genus ''Alligator'' of the Family (biology), family Alligatoridae in the Order (biology), order Crocodilia. The two Extant taxon, 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. The term "alligator" is likely an Anglicisation (linguistics), anglicized form of ', Spanish language, Spanish for "the lizard", which early Spanish explorers and settlers in Florida called the alligator. Early English language, English spellings of the name included ''allagarta'' and ''alagarto''. Evolution Alligators and caimans split in North America during the early Tertiary period, Tertiary or late Cretaceous (about 53 million to 65 million years ago). The Chinese alligator split from the America ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Procaimanoidea Kayi
''Procaimanoidea'' ("Before Caiman-forms") is an extinct genus of alligatorid from the Eocene of North America. It was named posthumously in 1946 by Charles W. Gilmore; the type species is ''P. utahensis'', from the Uintan (middle Eocene) of Utah. It is based on USNM 15996, a nearly complete skull and partial left hind leg. A second species, ''P. kayi'', was named in 1941 by C.C. Mook as a species of '' Hassiacosuchus'', for remains from the Bridgerian (early Eocene) of Wyoming. It was reassigned to ''Procaimanoidea'' in 1967 by Wassersug and Hecht. Description ''Procaimanoidea'' was a small alligatorid, and slightly heterodont, the last four teeth on each side of the jaws having blunt tips. Phylogeny Recent studies have consistently resolved ''Procaimanoidea'' as a member of Alligatorinae, although its relative placement is disputed, as shown by the cladograms below. Cladogram from 2018 Bona ''et al.'' study: Cladogram from 2019 Massonne ''et al.'' study: Cladogram fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Allognathosuchus Wartheni
''Allognathosuchus'' (meaning "other jaw crocodile") is an extinct genus of alligatorine crocodylian with a complicated taxonomic history. It was named in 1921. Description ''Allognathosuchus'' was a medium-sized predator up to 1.5 m in length. This alligatorine is known for its stout jaws and bulbous teeth, found near the rear of the tooth row in upper and lower jaws. These adaptations have historically been interpreted as having been for crushing mollusks. Isolated bulbous teeth are often assigned to this genus, although such teeth are known from other crocodyliform lineages. Taxonomy The type species, ''A. polyodon'', is from the Eocene-age Bridger Formation of Wyoming; it is based on fossils that are difficult to distinguish from other Paleogene alligatorids. ''A. heterodon'' is from the Eocene-age Wasatch Formation of Wyoming, ''A. wartheni'' is from the Eocene-age Wildwood Formation (also known as the "Wildwood alligatorid" and possibly two species), and ''A. wouters ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arambourgia Gaudryi
''Arambourgia'' is an extinct monotypic genus of alligatorine crocodylian from Europe. It was named in 1905 as ''Allognathosuchus gaudryi''. It was made a separate genus ''Arambourgia'' in 1940. This was synonymized with '' Allognathosuchus haupti'' in 1990 (now known as '' Hassiacosuchus haupti''), but later reassigned as its own genus once again in 2004. ''Arambourgia'' was likely to have been part of an early dispersal event of alligatorines from North America to Europe during the Eocene epoch. ''Arambourgia'' had non-serrated teeth and a deep orienirostral snout, unlike the flatter snouts of most other alligatorids. Recent studies have consistently resolved ''Arambourgia'' as a member of Alligatorinae, although its relative placement is disputed, as shown by the cladogram A cladogram (from Greek language, Greek ''clados'' "branch" and ''gramma'' "character") is a diagram used in cladistics to show relations among organisms. A cladogram is not, however, an Phylogenetic tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wannaganosuchus Brachymanus
''Wannaganosuchus'' (meaning "Wannagan crocodile", in reference to the Wannagan Creek site where it was discovered) is an extinct genus of small alligatorid crocodilian. It was found in Late Paleocene-age rocks of Billings County, North Dakota, United States. History and description ''Wannaganosuchus'' is based on SMM P76.28.247, a mostly complete skull and postcranial skeleton missing some vertebrae, coracoids, part of the feet, ribs, and other pieces. A few small bony scutes are also assigned to the genus, but not to the type specimen. SMM P76.28.247 was found semi-articulated in the lower part of the Bullion Creek Formation, near the base of a lignitic clay layer deposited in a marsh setting on a floodplain. ''Wannaganosuchus'' was named in 1982 by Bruce R. Erickson. The type species is ''W. brachymanus''; the specific name means "short forefoot". The skull of SMM P76.28.247 was low, without elevated rims over the eyes, and was long. The snout was sho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
