New discovered bird-like dinosaurs: Overaptor Chimtoi. A new genus and species of Paravian theropod dinosaurs has been identified from fossils found in Patagonia, Argentina. Reconstruction of the life of an adult and a juvenile Chimimoi oversoreptor. The newly discovered dinosaur roamed the Earth about 90 million years ago during the Cretaceous period.
Scientifically called the Overraptor Chimetoi, the ancient creature was a theropod from the grave, approximately 1.3 meters (4.3 feet) in length. He had very long and well-formed arms, the legs were well adapted for walking, and the second finger had a velociraptor sickle.
“This characteristic is not present in birds, whose feet are evolutionarily more advanced, which allows them to cling to tree branches,” says Matias Motta, lead author of CONICET and the Argentine Museum of Natural Sciences ‘Bernardino Rivacia’ and his Colleagues said.
The fossil remains of the Chimimoi Overoreptor were recovered from the beds of the Hinuclear Formation in the Patagonian province of Río Negro. The specimens were found with crocodile and turtle bones.
“There are characteristics that distinguish Overmoptor chanmoi from non-medical treatments in Argentina, as well as non-South American birds of prey such as Velociraptor,” said Dr. Fernando Novas, also of the Argentine Senate and Museum of Natural Sciences ‘Bernardino Rivia’. ‘
“When their arms were analyzed, we found characteristics of birds related to flight. This leads us to consider that in a phytogenetic tree, the overoraptor is closer to the quimetoe birds, which is higher than most of the raptors known so far. “
“Our hypothesis is that in the case of the Overoreopter Chimotai, its ability to automatically fold its wings should have a different function than that of flying birds, given that it is a running animal.” Motta said.
“It is possible that dinosaurs have a guaranteed role of balance in the arms during the race, by providing greater balance and precision, thanks to the possibility of moving them consistently, as in birds that run like the retha or the ostrich” .
“Certain characteristics of Overreptor Chimoeys bones, particularly the ulna, make them more similar to bird wings, such as rheas and condors, than other raptor dinosaurs, including the unlagged ones.” Chimimoi Overoreptor silhouette showing selected skeletal elements.
Scale bars: 50 cm in silhouette, 4 cm (A, B, D, H and J) and 2 cm (C, E, F, G and I). Paleontologists also found that the Overoraptor chimotai is related to Rahonavis, a Paravian theropod dinosaur that lived 70 million years ago (Cretaceous period) in what is now northwestern Madagascar.
“Both species had raptor-like legs and arms similar to bird feathers, which means that both antipalagos and velociraptors have absent evolutionary progress,” said Dr. Novas. That due to its structural characteristics, the Rahonavis should also have automatic wing folding, the ability to perform bird-specific performance, “said Motta.
“These similarities indicate that the Chimantoi and Rahonavis ovoretores may form a new group of Paravian corridors, which will be closer to birds than known raptor families.”
This discovery is reported in an article in the Science Journal of Nature.
Anzu wyliei – the discovery of new bird-shaped dinosaurs. American fossil scientists discovered a new raptor dinosaur that lived in western North America about 66 million years ago during the Cretaceous period. It is an artistic impression of Anju Vayali. Image from the Carnegie Museum of Natural History.
A new fossil creature resembling a cross between a modern emu and a reptile was described from three specimens that collectively conserve almost the entire skeleton, allowing paleontologists to study the anatomy and evolutionary relationships of the mysterious group called Kignagathades.
Samples were excavated from the upper layers of the Hale Creek rock formation in North and South Dakota, known for abundant fossils of Tyrannosaurus rex and Trickratops. Two of the samples show evidence of pathology.
One appears to have a broken and healed rib, and the other has evidence of some type of trauma to the toe, “said Dr. from Uta University. Emma Schneacher, co-author of the article published in the open access journal, said. PLoS One.
At 3.3 meters (11 feet) tall and 1.5 meters (5 feet) tall at the hip, the dinosaur looked like a giant flightless bird, rather than a typical theropod dinosaur like Tyrannosaurus rex. Their weight was estimated at 200-300 kg (440-660 lb). Its jaws clung to a toothless beak, and its head was a long, round crest like a steeple.
“It was a large raptor, but with a chicken head and possibly wings. The animal was about 11 feet tall, so it would be scary and absurd to find it,” said Dr. Schechner said.
Craniomandibular skeleton of Anzu wyliei. The beak dinosaur is scientifically called Anju Villiei. The genus is named after a bird-shaped demon in Mesopotamian mythology, and the specific name is from the dinosaur-loving grandson of the Carnegie Museum of Pittsburgh Trustees, a boy named Willie.
With large, sharp claws, Anju Vayali was an omnivorous vegetable eater, small animal, and probably egg-dwelling on a wet floodplain. The dinosaur apparently took a scraper. “I am really excited about this discovery because Anju Vayali is the largest oviraptosaurus found in North America,” said Dr. Schechner said.
“Oviraptorosaurs are a group of dinosaurs that are closely related to birds and often have strange, cassowary-like mucus.” They are widely known because the first fossil skeleton, described in 1924, was a nest of dinosaur eggs, suggesting that the creature died in the act of storming the nest.
This thought persisted until the 1990s, when a child with oviraptorids found the same type of egg, indicating that instead of a nest thief, the oviraptor was a loving parent who laid his eggs. It spoiled while protecting himself.
More than a dozen species of oviraptorids have been discovered, all in Mongolia and China, and many of them are known to be very well preserved, with complete or nearly complete skeletons.
Furthermore, in the early 1990s, overreptients of several small primitive relatives were found in rocks around 125 million years old in northeast China. Many of these are also represented by complete skulls or skeletons, some of which retain fossil feathers.
Paleontologists have established that canagnathaids, oviraptorids, and these more archaic Chinese species are closely related to each other, and have united them as the Oviraptorosauria group of theropods.
The appearance of Oviraptorosaurus in both Asia and North America was not surprising to paleontologists, as these continents were often interconnected during the Mesozoic Era, allowing dinosaurs and other land animals to roam among them.
However, because their fossils were incomplete, Cagnanathids remained the best-known member of Oviraptosauria, and in fact, at least one of the main groups of dinosaurs was understood.
“For nearly a hundred years, the presence of oviraptosaurs in North America was known only from parts of the skeleton, and the details of their presence and biology remained a mystery,” said study co-author Dr. Hans-Dieter Suss, to the Smithsonian. Institution’s National Museum of Natural History in Washington.
“With the discovery of anzu wyliei, we finally have fossil evidence to show what this species looked like and how it relates to other dinosaurs.