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Hallopoda
Hallopodidae is a family of Late Jurassic crocodylomorphs. They have been recovered as the closest relatives of the 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 pseudo .... References Prehistoric reptile families Late Jurassic crocodylomorphs Fossil taxa described in 1881 {{Jurassic-reptile-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hallopus
''Hallopus'' was a prehistoric reptile, named in 1877 as a species of ''Nanosaurus'' and classified by Othniel Charles Marsh, O. C. Marsh in 1881 from the Late Jurassic Morrison Formation. Today though the animal is thought to be a pseudosuchian more closely related to crocodilians. It was redescribed as a sphenosuchian Crocodylomorpha, crocodylomorph in 1970, now thought to be a paraphyletic group. It was a quite small animal, reaching a length of 1 m (3.3 ft) with long and slender limbs. ''Macelognathus'', a similarilly slender-proportioned crocodylomorph to ''Hallopus'', may be synonymous with it. History and naming The holotype specimen of ''Hallopus'' was discovered by near Canyon City, Colorado and acquired by a collector named Baldwin for three dollars in a local curiosity shop in Colorado Springs. According to letters later chronicled by Schuchert (1939), he found out about the fossil after hearing about the discovery of a supposed fossil bird, before later trav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Late Jurassic
The Late Jurassic is the third epoch of the Jurassic Period, and it spans the geologic time from 163.5 ± 1.0 to 145.0 ± 0.8 million years ago (Ma), which is preserved in Upper Jurassic strata.Owen 1987. In European lithostratigraphy, the name "Malm" indicates rocks of Late Jurassic age. In the past, ''Malm'' was also used to indicate the unit of geological time, but this usage is now discouraged to make a clear distinction between lithostratigraphic and geochronologic/chronostratigraphic units. Subdivisions The Late Jurassic is divided into three ages, which correspond with the three (faunal) stages of Upper Jurassic rock: Paleogeography During the Late Jurassic Epoch, Pangaea broke up into two supercontinents, Laurasia to the north, and Gondwana to the south. The result of this break-up was the spawning of the Atlantic Ocean. However, at this time, the Atlantic Ocean was relatively narrow. Life forms of the epoch This epoch is well known for many famous types of dinosau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Othniel Charles Marsh
Othniel Charles Marsh (October 29, 1831 – March 18, 1899) was an American professor of Paleontology in Yale College and President of the National Academy of Sciences. He was one of the preeminent scientists in the field of paleontology. Among his legacies are the discovery or description of dozens of new species and theories on the origins of birds. Born into a modest family, Marsh was able to afford higher education thanks to the generosity of his wealthy uncle George Peabody. After graduating from Yale College in 1860 he travelled the world, studying anatomy, mineralogy and geology. He obtained a teaching position at Yale upon his return. From the 1870s to 1890s, he competed with rival paleontologist Edward Drinker Cope in a period of frenzied Western American expeditions known as the Bone Wars. Marsh's greatest legacy is the collection of Mesozoic reptiles, Cretaceous birds, and Mesozoic and Tertiary mammals that now constitute the backbone of the collections of Yale's Peabo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1881 In Paleontology
Molluscs Bivalves Dinosaurs Newly named dinosaurs Pterosaurs New taxa Synapsids Non-mammalian Paleontologists * Death of the Reverend William Fox a significant early collector of dinosaur fossils from the Isle of Wight.{{cite book, last = Farlow, first = James O., author2= M. K. Brett-Surmann, title = The Complete Dinosaur, publisher = Indiana University Press, year = 1999, location = Bloomington, Indiana, pages = 15, isbn = 0-253-21313-4 References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genera
Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus '' Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants of an ancestral taxon are grouped together (i.e. phylogenetic analysis should clearly demons ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macelognathus
''Macelognathus'' is an extinct genus of sphenosuchian crocodylomorph from the Late Jurassic. Originally it was believed be a turtle and later a dinosaur. It lived in what is now Wyoming, in North America.Moodie, R.L. 1908. The relationship of the turtles and plesiosaurs. Kansas University Scientific Bulletin, 4: 319–327. The type species, ''Macelognathus vagans'', was described by Othniel Charles Marsh in 1884 as a turtle based on a partial jaw from the Late Jurassic Morrison Formation at Como Bluff, Wyoming. After being referred to the Dinosauria by Moodie in 1908, it was later reclassified by Ostrom in 1971 as a crocodilian relative.Ostrom, J.H. (1971). "On the systematic position of ''Macelognathus vagans''". ''Postilla'' 153:1-10. Based on new material from the Morrison Formation at Fruita, Colorado, in 2005 Göhlich ''et al.'' identified it as a basal crocodylomorph ("sphenosuchian"). It is considered an example of convergent evolution, due to the similarities to cae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Almadasuchus
''Almadasuchus'' is an extinct genus of crocodylomorph known from the early Middle Jurassic (early Bajocian stage) Puesto Almada Member of the Cañadón Asfalto Formation of Patagonia, Argentina. It contains a single species, ''Almadasuchus figarii''. It is known from the holotype MPEF-PV 3838, a well-preserved posterior region of the skull as well as other skull and postcranial remains. Description According to a phylogenetic analysis that accompanied the first description of the species, ''A. figarii'' is the sister taxon or closest relative of the clade Crocodyliformes, a large group that originated in the Late Triassic and includes modern crocodilians. It is also a close relative of "sphenosuchians", a paraphyletic group of more basal non-crocodyliform crocodylomorphs. ''Almadasuchus'' is most closely related to the "sphenosuchian" ''Junggarsuchus'' from the Middle Jurassic of China. ''Almadasuchus'' is one of only four non-crocodyliform crocodylomorphs known from af ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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