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The theropod Dilophosaurus is commonly depicted in popular culture as being venomous, but this portrayal is not considered likely by the scientific community.
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theropod and is
Albertosaurus (; meaning " Alberta lizard ") is a genus of tyrannosaurid theropod dinosaur that lived in western North America during the Late Cretaceous Period, about 70 million years ago.
An example of macroevolution is the appearance of feathers during the evolution of birds from theropod dinosaurs.
Velociraptor (; meaning ' swift seizer ') is a genus of dromaeosaurid theropod dinosaur that existed approximately 75 to 71 million years ago during the later part of the Cretaceous Period.
Tyrannosauridae ( or tyrannosaurids, meaning " tyrant lizards ") is a family of coelurosaurian theropod dinosaurs which comprises two subfamilies containing up to six genera, including the eponymous Tyrannosaurus.
Daspletosaurus ( ; meaning " frightful lizard ") is a genus of tyrannosaurid theropod dinosaur that lived in western North America between 77 and 74 million years ago, during the Late Cretaceous Period.
" four " plus δακτυλος = " finger ") is the condition of having four digits on a limb, as in many amphibians, birds, and theropod dinosaurs.
Theropoda ( theropod ; suborder name Theropoda, from Greek meaning " beast feet ") is both a suborder of bipedal saurischian dinosaurs, and a clade consisting of that suborder and its descendants ( including modern birds ).
The smallest non-avialan theropod known from adult specimens is the troodontid Anchiornis huxleyi, at 110 grams in weight and 34 centimeters ( 1 ft ) in length.
Size of Aepyornis maximus ( centre, in purple ) compared to a human, an ostrich ( second from right, in maroon ), and some non-avian theropod dinosaur s. Each gridline is one meter in height
Archaeopteryx is one of the most famous transitional fossils and gives evidence for the evolution of birds from theropod dinosaurs.
Archaeopteryx is a genus of theropod dinosaur closely related to the birds.
Troodontidae is a family of bird-like theropod dinosaurs.
Gastroliths have only rarely been found in association with fossils of theropod dinosaurs and a trituration of their food with the stones is not plausible.
Gallimimus ( ; meaning " chicken or rooster mimic ") is a genus of ornithomimid theropod dinosaur from the late Cretaceous period ( Maastrichtian stage ) Nemegt Formation of Mongolia.
Furthermore, the authenticity of " Archaeoraptor " would not have been an essential proof for the hypothesis that birds are theropods, as this is sufficiently corroborated by other data ; paleontologist Christopher Brochu concluded in November 2001: " That birds are derived theropod dinosaurs is no longer the subject of scholarly dispute.
Megalosaurus ( meaning " Great Lizard ", from Greek, μεγαλο -/ megalo-meaning ' big ', ' tall ' or ' great ' and σαυρος / sauros meaning ' lizard ') is a genus of large meat-eating theropod dinosaurs of the Middle Jurassic period ( Bathonian stage, 166 million years ago ) of Europe ( Southern England, France, Portugal ).
Utahraptor ( meaning " Utah's predator " or " Utah thief ") is a genus of theropod dinosaurs, including the largest known members of the family Dromaeosauridae.
Compsognathus (; Greek kompsos / κομψός ; " elegant ", " refined " or " dainty ", and gnathos / γνάθος ; " jaw ") is a genus of small, bipedal, carnivorous theropod dinosaurs.
Although not recognized as such at the time of its discovery, Compsognathus is the first theropod dinosaur known from a reasonably complete fossil skeleton.
Oviraptor is a genus of small Mongolian theropod dinosaur, first discovered by the paleontologist Roy Chapman Andrews, and first described by Henry Fairfield Osborn, in 1924.
Dromaeosauridae is a family of bird-like theropod dinosaurs.
Segnosaurus (' slow lizard ') is a genus of herbivorous theropod dinosaur belonging to the Therizinosauridae from the Cretaceous of Mongolia.
theropod and popular
Tyrannosaurus was the largest and most popular theropod known to the general public for many decades.
Contrary to the way theropods have often been reconstructed in art and the popular media, the range of motion of theropod forelimbs was severely limited, especially compared with the forelimb dexterity of humans and other primates.
theropod and being
Despite being an early dinosaur, the evolution of the theropod body form had already advanced greatly from creatures like Herrerasaurus and Eoraptor.
The researchers described theropod phalanges as being " pathognomonic " for stress fractures, this means they are " characteristic and unequivocal diagnostically.
Though the arms of Deinocheirus have a considerable absolute size, being the longest of any known theropod with the exception of Therizinosaurus, they are not very long relative to the shoulder girdle, the ratio being less than that with most ornithomimosaurs.
theropod and considered
Huene placed most of the small theropod groups into Coelurosauria, and the large theropods and prosauropods into Pachypodosauria, which he considered ancestral to the Sauropoda ( prosauropods were still thought of as carnivorous at this time, owing to the incorrect association of rauisuchian skulls and teeth with prosauropod bodies, in animals such as Teratosaurus ).
Some studies have found Eoraptor lunensis ( also from the Ischigualasto Formation ), traditionally considered a theropod, to be an early member of the sauropodomorph lineage, which would make it the most basal sauropodomorph known.
Rauhut considered coelurids to be a monophyletic group of basal coelurosaurs, characterized by evolutionary reversals in some aspects of the vertebrae to the more primitive theropod condition.
She is an evolved Archaeopteryx, which is a derived theropod dinosaur, considered to be the first " true " bird.
It has since then usually been considered a theropod dinosaur.
theropod and likely
Most pathologies preserved in theropod fossils are the remains of injuries like fractures, pits, and punctures, often likely originating with bites.
This largest Giganotosaurus specimen is estimated to represent an individual with a skull length of, compared to the holotype's estimated at skull, making it likely that Giganotosaurus had the largest skull of any known theropod.
Acrocanthosaurus was the largest theropod in its ecosystem and likely an apex predator which possibly preyed on large sauropods and ornithopods.
Because the Glen Rose Formation is close to the Antlers and Twin Mountains Formations in both geographical location and geological age, and the only large theropod known from those formations is Acrocanthosaurus, the study concluded that Acrocanthosaurus was most likely to have made the tracks.
The smaller theropod Deinonychus also prowled the area but at 3 meters ( 10 ft ) in length, most likely provided only minimal competition for Acrocanthosaurus.
In 1992 Paul Sereno and Rupert Wild stated that even the holotype specimen consisted of fossils from two separate animals: the postcranial skeleton would be a theropod, likely a coelophysoid related to Segisaurus, but the skull and the von Huene specimens they referred to the basal crocodylomorph Saltoposuchus connectens.
theropod and by
Of all the theropod groups, the coelurosaurs were by far the most diverse.
" In light of these and other discoveries, by the late 1970s Rinchen Barsbold created a new series of theropod infraorders: Coelurosauria, Deinonychosauria, Oviraptorosauria, Carnosauria, Ornithomimosauria, and Deinocheirosauria.
Several major theropod groups were named by Jacques Gauthier in 1986, including the clade Tetanurae for one branch of a basic theropod split with another group, the Ceratosauria.
The most intensive study of theropod systematics by members of the Theropod Working Group has uncovered striking similarities among the most basal dromaeosaurids, troodontids, and Archaeopteryx.
When it was first described by Sereno and Forster in 1993, it was regarded as a theropod, based on its " functionally tridactyl hand " and other features.
Edwin H. Colbert has suggested that Connecticut Valley theropod footprints referred to the ichnogenus Grallator may have been made by Coelophysis.
Large theropod footprints discovered in Texas may have been made by Acrocanthosaurus, although there is no direct association with skeletal remains.
The authors concluded that this association was a regurgitated pellet and, from the details of the digestion and the size, that the hatchlings were swallowed whole by a pterosaur or small theropod dinosaur.
In all, over a hundred distinct anatomical features are shared by birds and theropod dinosaurs.
Tetanurae meaning " stiff tails ", was named by Jacques Gauthier on cladistic grounds in 1986 for a large group of theropod dinosaurs.
The superfamily Therizinosauroidea had been established by Maleev in 1954, to include only the bizarre, giant-clawed theropod Therizinosaurus.
This view is further supported by ichnological records showing large tridactyl ( three-toed ) footprints that can be attributed only to a theropod dinosaur.
Bambiraptor is a Late Cretaceous, 75 million year old, bird-like dromaeosaurid theropod dinosaur described by scientists at the University of Kansas, Yale University, and the University of New Orleans.
First thought to be a juvenile Tyrannosaurus, then interpreted as a large dromaeosaurid, this " Jordan theropod " was given the name Aublysodon molnaris by Gregory S. Paul in 1988 ; in 1990 the name was by Paul emended to Aublysodon molnari, applying the correct genitive.
The localization in theropod scapulae as evidenced by the tendon avulsion in Sue suggests that theropods may have had a musculature more complex and functionally different than those of their descendants, the birds.
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