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Arizonasaurus
''Arizonasaurus'' was a ctenosauriscid archosaur from the Middle Triassic (243 million years ago). ''Arizonasaurus'' is found in the Middle Triassic Moenkopi Formation of northern Arizona. A fairly complete skeleton was found in 2002 by Sterling Nesbitt. The taxon has a large sailback formed by elongated neural spines of the vertebrae. The type species, ''Arizonasaurus babbitti'', was named by Samuel Paul Welles in 1947. Discovery and naming The type species, ''Arizonasaurus babbitti'', was named by Samuel Paul Welles in 1947 on the basis of a few teeth and a maxilla, labelled as specimen UCMP 36232. A fairly complete skeleton was found in 2002 by Sterling Nesbitt. Description ''Arizonasaurus'' had a sail made of tall neural spines. This sail was similar to those of other basal archosaurs, such as other ctenosauriscids like ''Ctenosauriscus'', ''Lotosaurus'', ''Bromsgroveia'', and ''Hypselorhachis''. ''Arizonasaurus'' is described from two braincase specimens. Some ancestral f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arizonasaurus BW
''Arizonasaurus'' was a Ctenosauriscidae, ctenosauriscid archosaur from the Middle Triassic (243 million years ago). ''Arizonasaurus'' is found in the Middle Triassic Moenkopi Formation of northern Arizona. A fairly complete skeleton was found in 2002 by Sterling Nesbitt. The taxon has a large sailback formed by elongated neural spines of the vertebrae. The type species, ''Arizonasaurus babbitti'', was named by Samuel Paul Welles in 1947. Discovery and naming The type species, ''Arizonasaurus babbitti'', was named by Samuel Paul Welles in 1947 on the basis of a few teeth and a maxilla, labelled as specimen UCMP 36232. A fairly complete skeleton was found in 2002 by Sterling Nesbitt. Description ''Arizonasaurus'' had a sail made of tall neural spines. This sail was similar to those of other basal archosaurs, such as other ctenosauriscidae, ctenosauriscids like ''Ctenosauriscus'', ''Lotosaurus'', ''Bromsgroveia'', and ''Hypselorhachis''. ''Arizonasaurus'' is described from two br ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rauisuchia
"Rauisuchia" is a paraphyletic group of mostly large and carnivorous Triassic archosaurs. Rauisuchians are a category of archosaurs within a larger group called Pseudosuchia, which encompasses all archosaurs more closely related to crocodilia Crocodilia (or Crocodylia, both ) is an order of mostly large, predatory, semiaquatic reptiles, known as crocodilians. They first appeared 95 million years ago in the Late Cretaceous period ( Cenomanian stage) and are the closest living ...ns than to birds and other dinosaurs. First named in the 1940s, Rauisuchia was a name exclusive to Triassic archosaurs which were generally large (often ), carnivorous, and quadrupedal with a pillar-erect hip posture, though exceptions exist for all of these traits. Rauisuchians, as a traditional Taxonomy, taxonomic group, were considered distinct from other Triassic archosaur groups such as early dinosaurs, Phytosaur, phytosaurs (crocodile-like carnivores), Aetosaur, aetosaurs (armored herbivor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ctenosauriscidae
Ctenosauriscidae is an extinct family (biology), family of pseudosuchian archosaurs within the clade Poposauroidea. Ctenosauriscids existed in Africa, Asia, Europe and North America during the Early Triassic to the Middle Triassic period (latest Olenekian to Anisian stages). All species had large "sails" on their backs. Ctenosauriscids are among some of the earliest archosaurs and represent the first global radiation of the group. Genera Phylogeny Ctenosauriscidae was named by Oskar Kuhn in 1964 in paleontology, 1964 to include the genus ''Ctenosauriscus''. It is a stem-based taxon defined by Richard J. Butler, Stephen L. Brusatte, Mike Reich, Sterling J. Nesbitt, Rainer R. Schoch and Jahn J. Hornung in 2011 as "the most inclusive clade containing ''Ctenosauriscus koeneni'' but not ''Poposaurus gracilis'', ''Effigia okeeffeae'', ''Postosuchus kirkpatricki'', ''Crocodylus niloticus'', ''Ornithosuchus longidens'', or ''Aetosaurus ferratus''". The cladograms below follows a 2011 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ctenosauriscidae
Ctenosauriscidae is an extinct family (biology), family of pseudosuchian archosaurs within the clade Poposauroidea. Ctenosauriscids existed in Africa, Asia, Europe and North America during the Early Triassic to the Middle Triassic period (latest Olenekian to Anisian stages). All species had large "sails" on their backs. Ctenosauriscids are among some of the earliest archosaurs and represent the first global radiation of the group. Genera Phylogeny Ctenosauriscidae was named by Oskar Kuhn in 1964 in paleontology, 1964 to include the genus ''Ctenosauriscus''. It is a stem-based taxon defined by Richard J. Butler, Stephen L. Brusatte, Mike Reich, Sterling J. Nesbitt, Rainer R. Schoch and Jahn J. Hornung in 2011 as "the most inclusive clade containing ''Ctenosauriscus koeneni'' but not ''Poposaurus gracilis'', ''Effigia okeeffeae'', ''Postosuchus kirkpatricki'', ''Crocodylus niloticus'', ''Ornithosuchus longidens'', or ''Aetosaurus ferratus''". The cladograms below follows a 2011 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hypselorhachis
''Hypselorhachis'' is a genus of extinct reptile, possibly a ctenosauriscid archosaur related to ''Ctenosauriscus''. It lived during the Triassic Period. It is currently known only from a single vertebra found from the Middle Triassic Manda Beds in Tanzania. The vertebra is preserved in reasonably good condition, as although the tall neural spine is chipped in several places it is not broken despite being quite slender, only around 20 mm thick transversely. The type species is ''H. mirabilis'', mentioned but never fully described by English paleontologist Alan J. Charig. ''Hypselorhachis'' was assigned to the Ctenosauriscidae, a group of sail-backed archosaurs, in 1988.Carroll, R.L. (1988). ''Vertebrate Paleontology and Evolution''. W.H. Freeman and Company It was formally described by Richard J. Butler and co-workers in 2009. The name means 'wonderful high spine', from the Latin 'mirabilis' 'wonderful' and the Greek 'ὑπσελος', 'high' and 'ῥαχις' 'spine' or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bromsgroveia
''Bromsgroveia'' is an extinct genus of predatory ctenosauriscid archosaur from the Middle Triassic Bromsgrove Sandstone of England. Ctenosauriscids were a group of rauisuchians that was related to the ancestors of modern crocodiles and alligators. Classification ''Bromsgroveia'' was closely related to ''Ctenosauriscus'', and together with a few other genera they make up Ctenosauriscidae Ctenosauriscidae is an extinct family (biology), family of pseudosuchian archosaurs within the clade Poposauroidea. Ctenosauriscids existed in Africa, Asia, Europe and North America during the Early Triassic to the Middle Triassic period (latest .... The ctenosauriscids were closely related to the Poposauridae, poposaurids, as shown by a few shared derived characteristics. The pelvic girdle in ''Bromsgroveia'' unites this taxon with ''Ctenosauriscus'', ''Lotosaurus'', ''Arizonasaurus'', and ''Hypselorhachus''. Below is a phylogenetic cladogram simplified from Butler ''et al.'' in 2011 showing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crurotarsan
Crurotarsi is a clade of archosauriform reptiles that includes crocodilians and stem-crocodilians and possibly bird-line archosaurs too if the extinct, crocodile-like phytosaurs are more distantly related to crocodiles than traditionally thought. Prior to 2011, the group had invariably included only archosaurs closer to crocodilians than to birds and other dinosaurs. An equivalent term for the crocodilian side of the archosaur family tree is Pseudosuchia. This traditional definition of Crurotarsi assumed that phytosaurs were crown-group archosaurs and more closely related to crocodilians than to birds. However, a 2011 study argued that the phytosaur lineage evolved prior to the split between birds and crocodilians. This would mean that phytosaurs were not true archosaurs, and therefore could not be considered representatives of croc-line archosaurs. The name Crurotarsi is derived from the Latin word ''crus'' (lower leg) and the Greek word ''tarsos'' (ankle). It refers to the spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1947 In Paleontology
Mosses Archosauromorphs Newly named dinosaurs Data courtesy of George Olshevsky's dinosaur genera list. Newly named pseudosuchians Synapsids Non-mammalian References {{portal, Paleontology 1940s in paleontology Paleontology Paleontology (), also spelled palaeontology or palæontology, is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene epoch (roughly 11,700 years before present). It includes the study of fossi ... Paleontology 7 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Poposaurus
''Poposaurus'' (" Popo Agie reptile") is an extinct genus of pseudosuchian archosaur from the Late Triassic of the southwestern United States. It belongs to the clade Poposauroidea, an unusual group of Triassic pseudosuchians that includes sail-backed, beaked, and aquatic forms. Fossils have been found in Wyoming, Utah, Arizona, and Texas. Except for the skull, most parts of the skeleton are known. The type species, ''P. gracilis'', was described and named by Maurice Goldsmith Mehl in 1915. A second species, ''P. langstoni'', was originally the type species of the genus ''Lythrosuchus''. Since it was first described, ''Poposaurus'' has been variously classified as a dinosaur, a phytosaur, and a "rauisuchian". Like theropod dinosaurs, ''Poposaurus'' was an obligate biped, meaning that it walked on two legs rather than four. However, as a pseudosuchian, it is more closely related to living crocodilians than to dinosaurs. ''Poposaurus'' is thought to have evolved this form of locomo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ctenosauriscus
''Ctenosauriscus'' is an extinct genus of sail-backed poposauroid archosaur from Early Triassic deposits of Lower Saxony in northern Germany. It gives its name to the family Ctenosauriscidae, which includes other sail-backed poposauroids such as ''Arizonasaurus''. Fossils have been found in latest Olenekian deposits around 247.5-247.2 million years old, making it one of the first known archosaurs. History of discovery ''Ctenosauriscus'' is known from the holotype, GZG.V.4191, a single partial preserved postcranial skeleton including partial vertebral column, ribs and girdle. The holotype is composed of four slabs, which were labeled A1, A2, B1, and B2 in a 2011 study. Slabs A1 and B1 form the part and slabs A2 and B2 form the counterpart. The holotype was discovered in early 1871 in the Bremke dell locality, near the county of Göttingen. The holotype was found in a deposit called the Solling-Bausandstein, which is an outcropping of the upper Middle Buntsandstein in the region of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lotosaurus
''Lotosaurus'' is an extinct genus of sail-backed poposauroid Poposauroidea is a clade of advanced pseudosuchians (archosaurs closer to crocodilians than to dinosaurs). It includes poposaurids, shuvosaurids, ctenosauriscids, and other unusual pseudosuchians such as ''Qianosuchus'' and ''Lotosaurus''. Howeve ... known from Hunan Province of central China. Discovery ''Lotosaurus'' is known from the holotype IVPP V 4881 (or possibly V 4880), an articulated and well-preserved skeleton. Other referred specimens include IVPP V 48013 (a skull) as well as many articulated and disarticulated skeletal remains concentrated in a bonebed which is almost completely composed of ''Lotosaurus'' bones. All known specimens of this genus were collected from this bonebed, known as the ''Lotosaurus'' site, which belongs to the Batung Formation (or alternatively Xinlingzhen Formation of the Badong Group). Further excavations in 2018 revealed many more specimens, as well as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moenkopi Formation
The Moenkopi Formation is a geological formation that is spread across the U.S. states of New Mexico, northern Arizona, Nevada, southeastern California, eastern Utah and western Colorado. This unit is considered to be a group in Arizona. Part of the Colorado Plateau and Basin and Range, this red sandstone was laid down in the Lower Triassic and possibly part of the Middle Triassic, around 240 million years ago. History of investigation There is no designated type locality for this formation. It was named for a development at the mouth of Moencopie Wash in the Grand Canyon area by Ward in 1901. In 1917 a 'substitute' type locality was located by Gregory in the wall of the Little Colorado Canyon, about 5 miles below Tanner Crossing in Coconino County, Arizona. While in the Great Basin, Bassler and Reeside characterized and named the Rock Canyon Conglomerate, Virgin Limestone, and Shnabkaib Shale members in 1921. Salt Creek (later replaced by Wupatki and Moqui Members) and the H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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