April 27, 2020

DILOPHOSAURUS

By Checker Bot

Updated 05-May-2020.

Mondo shtuff from around the internet, all about DILOPHOSAURUS!

Genus Dilophosaurus: Dilophosaurus (/daɪˌloʊfəˈsɔːrəs, -foʊ-/ dy-LOHF-o-SOR-əs) is a genus of theropod dinosaur that lived in what is now North America during the Early Jurassic, about 193 million years ago. Three skeletons were discovered in northern Arizona in 1940, and the two best preserved were collected in 1942. The most complete specimen became the holotype of a new species in the genus Megalosaurus, named M. wetherilli by Samuel P. We (Source: Wikipedia, ”, http://en.wikipedia.org/wiki/Dilophosaurus, CC BY-SA 3.0 . Photo: (c) Eden, Janine and Jim, some rights reserved (CC BY))

Pickering’s taxa 6: Dilophosaurus breedorum: “Liassaurus” involves somewhat difficult decisions in regard to Sarcosaurus and the relationships of both taxa, so here’s Dilophosaurus “b…

Dilophosaurus | Meaning of Dilophosaurus by Lexico: What does dilophosaurus mean? dilophosaurus is defined by the lexicographers at Oxford Dictionaries as The earliest of the large bipedal dinosaurs, which had two long crests on the head and occurred in the early Jurassic…

My botty best at summarizing from Wikipedia: three skeletons were discovered in northern Arizona in 1940 . two best preserved were collected in 1942 . the most complete specimen became the holotype of a new species in the genus Megalosaurus . the species name honors John Wetherill, a Navajo councilor . further specimens have since been found, including an infant . footprints have also been attributed to the animal, including resting the mandible was slender and delicate at the front, but deep at the back . the teeth were long, curved, thin, and compressed sideways . it had a pair of longitudinal, plate-shaped Those in the lower jaw were much smaller than those of the upper jaw . most of the teeth had serrations at their front and back edges . the neck was long, and its vertebrae were hollow, and very light dilophosaurus is a member of the family Dilophosauridae along with Dracovenator . due to the limited range of movement, the mouth may have made first contact with prey . the holotype specimen had multiple paleopathologies, including healed injuries . it was designated as the state dinosaur of Connecticut in 2017 . Dilophosaurus is known from the Kayenta Formation . the largest known specimen weighed about 400 kilograms (880 lb) it measured about 7 meters (23 ft) in length . the smaller holotype specimen had a hip height of about 1.36 meters ( the snout was narrow in front view, becoming narrower towards the rounded top . the premaxilla formed a wall for a gap between itself and the maxilla called the subnarial gap the subnarial gap resulted in a diastema, a gap in the tooth row . the outer surface of the premaxilla was covered in foramina (openings) of it had a dip towards the font, which made the area by its base concave in profile . the premaxilla was shallow, and was depressed around the antorbital fenestra . nutrient groove ran backwards from the subnarial pit along the base of the interdental plates (or rugosae) of the maxilla.Dilophosaurus bore a pair of only one specimen preserves the shape of the crests . it is unknown if they differed in other individuals . the lacrimal bone had a unique thickened upper rim . a projection from the quadrate bone into the lateral temporal fenestra gave this a reniform (kidney-shaped) outline . the mandible was slender and delicate at the teeth were generally long, thin, and recurved, with relatively small bases . they had a large foramen at the tip and a row of small foramina ran in rough parallel . the largest tooth of the maxilla was either in or near the fourth alveolus . the third or fourth tooth in the dentary of Dilophosaurus and some coelophysoids was the largest at least the second and third teeth of the premaxilla had serrations, but the fourth tooth did not . the teeth were covered in a thin layer of enamel, 0.1 to 0.15 millimeters thick the jaws contained replacement teeth at various stages of eruption . the cervical vertebrae were unusually light; their centra were hollowed out by pleurocoels . the arches of the cervical vertebrae also had chonoses, conical recesses so large that the bones separating them were sometimes paper-thin . the cervical ribs were slender and may the centra and spines of the cervical vertebrae were long and low . the spines had caps that gave the appearance of a Maltese cross (cruciform) when seen from above, a distinctive feature of this the scapulae were wide, particularly the upper part, which was rectangular (or squared off), a unique feature . the arms were powerful, and had deep pits and stout processes for attachment of the third finger was reduced, and the fourth was vestigial (retained, but without function) the hind legs were large, with a slighter longer femur (thigh bone) than tibia ( the tibia had a developed tuberosity and was expanded at the lower end . it had long, stout feet with three well-developed toes that bore large claws . word of this was three dinosaur skeletons were found in purplish shale, about 9.1 meters (30 ft) long at one side . the first was nearly complete, lacking only the front of the skull, parts of the first skeleton was cleaned and mounted at the UCMP . the process took three men two years . as the skull was crushed, it was reconstructed . the dinosaur was a new species in the existing genus Megalosaurus, M. wetherilli . the specific name honored John Wetherill, a Navajo councilor . Welles Megalosaurus was used as a “wastebasket taxon” at the time . skeleton found 0.25 miles south of where 1942 specimens were found . one crest was originally thought to be part of crests were as unexpected as finding “wings on a worm”, says welles . reexamination of holotype specimen found to have bases of bones crushed together . two 1942 specimens were in 1970 Welles coined the new genus name Dilophosaurus . the name comes from the Greek words di () meaning “two”, lophos meaning “crest” and sauros meaning “liz dilophosaurus was the first well-known theropod from the Early Jurassic . in 2001 paleontologist identified remains of at least three new specimens . the specimens were found in 1978 in the Rock some elements in the collection belonged to an infant specimen (MNA P1.3181) one of the earliest known infant theropods from North America, only preceded by some Coelophysis specimens a nearly complete theropod skeleton was discovered in 1987 . it is similar to Dilophosaurus, with crests and a gap separating the premaxilla from the maxilla . in 1998 the american paleontologist Matthew C. Lamanna and colleagues found D. sinensis to be identical to Sinosaurus triassicus, named in 1940 . in 2013, they confirmed the species belonged in Sino in 1984 Welles conceded that there was no way to prove or disprove that the footprints belonged to Dilophosaurus . in 1996 the american paleontologists reported a trackway of the ichn in 1996, Gierliski attributed track AC 1/7 to a theropod similar to Dilophosaurus . he assigned it to the ichnotaxon Grallator miniscul attribution to Dilophosaurus based on wide angle between digit impressions three and four . splay in holotype foot was merely result of distortion, says paleontologist . weems the long claw marks that distinguish Dilophosauripus may be an artifact of dragging . differences between ichnotaxa may reflect how the track-maker interacted with the substrate . weems Welles and the paleontologist Robert A. Long found Dilophosaurus to be a ceratosauroid . in 1984 welles found dilophossaurus exhibited features of Coeluros in 1994 the american paleontologist Thomas R. Holtz placed Dilophosaurus in the group Coelophysoidea . in 2000 the american paleontologist divided Ceratosauria cladistic analysis suggests they did not belong in Coelophysoidea, but in Neotheropoda . peter bergen: if Dilophosaurus was more derived than Co Dilophosauridae shares features with Coelophysoidea such as the subnarial gap . features shared with Averostra include a fenestra at the front of the welles did not find evidence of cranial kinesis in the skull of Dilophosaurus . he thought it was probably a scavenger rather than a predator . in 1988 Paul authors suggest that the front of the mandible was used to capture and manipulate prey . the properties of its mandibular symphysis were similar to felids and crocodil the end of the jaws were expanded to the sides, forming a “rosette” of interlocking teeth . both groups also had long arms with well-developed claws, which could help when catching fish . in 1990 the paleontologists suggested that Dilophosaurus could have been an efficient swimmer . they found it doubtful that it would have been restricted to a watery environment, though . Paul depicted dilophos a 2015 article by Senter and Robins gave recommendations for how to reconstruct the forelimb posture in bipedal dinosaurs . the scapulae were held very horizontally, the resting orientation of the elbow in 2018, Senter and Corwin Sullivan examined the range of motion in the forelimb joints of Dilophosaurus by manipulating the bones . they also took into account that experiments with alligator carcasses show that the the inability to pronate the wrists was a plesiomorphic feature shared by theropods and other dinosaur groups . the wrist had limited mobility, and the fingers diverged during flexion, the footprints reported by welles in 1971 were all on the same level . footprints had been imprinted in mud, which allowed the feet to sink down 5–10 centimeters . the prints were s the footprints had an offset second toe with a thick base, and very long, straight claws . in 1984 Welles interpreted the fact that three individuals were closely together . criss-crossed archaeologist: flash floods may have picked up scattered bones from different individuals . he says there is no direct evidence that they may have traveled in small groups . the bones were deposited in lacustrine beach the dinosaur shuffled forwards, leaving new impressions with its feet, metatarsals, and ischium, but not the hands . crouching posture was found to be very similar to that of modern birds theropods are often depicted with their palms facing downwards . studies of their functional anatomy have shown that they were unable to pronate or supinate their arms . the track showed the legs crests, frills, horns, domes used for species recognition, he says . other explanations dismissed as unsupported by evidence . sexual selection is more likely explanation, says paleontologist . in 2005 Tykoski found that most Dilophosaurus specimens known were juvenile individuals . in 2005 Gay found no evidence of sexual dimorphism suggested by Paul . more data was needed to determine this . Dilophosaurus may have attained a growth rate of 30 to 35 kilograms (66 to 77 lb) per year early in life . replacement teeth originated deep inside the bone, decreasing in size the farther they when a tooth neared the gum line, the inner wall between the interdental plates was resorbed and formed a nutrient notch . as the new tooth erupted, it moved out anomaly can be caused by stress in animal populations, for example due to disturbances in environment . asymmetry can also result from traumatic events in early development of an animal . in 2001 study examined 60 Dilophosaurus holotype specimen had eight afflicted bones, whereas no other theropod specimen is known with more than four . on its left side it had a fractured scapula and radius, and osteodysplasia may have caused the deformities of the humerus and third finger . the disease affects juvenile birds that have experienced malnutrition . use of forelimbs for prey capture paleopathologies in dinosaurs are underreported, according to a new study . the pathologies significantly altered the range of motion in the right shoudler and right third finger of the holotype a definitive radiometric dating of this formation has not yet been made . the Kayenta Formation has yielded a small but growing assemblage of organisms . most organisms known so far are vertebrates . non-vertebrates include microbial or “algal” limestone, petrified wood, plant impressions . trace fossils have been found in vertebrate the majority of these finds come from the vicinity of Gold Spring, Arizona . holotype skeleton was found lying on its right side, and its head and neck were recurved – curved backwards – pose was thought to be opisthotonus (due to death-spasms) at the time . holotype specimen appears disturbed by scavengers, indicated by rotated dor Jurassic park dinosaurs may have been transported by a flood, experts say . they may have lain on the surface and weathered for some time before transport . a cowl folded against its neck expanded and vibr dilophosaurus of the movie was realized through puppeteering . separate legs were constructed for a shot where the dinosaur hops by . no computer-generated imagery was employed when showing the dinosaur . if the dinosaur had a frill, there would have been evidence for this in the bones . the dinosaur would not have used it to intimidate its meal, but rather a competitor . in 2017 Dilophosaurus in 1981 a sculpture of Dilophosaurus, the first life-sized reconstruction of this dinosaur, was donated to the park . the fossils had been taken without permission from the Navajo Reservation . a Nar

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