Washington [US], July 26 (ANI):슬롯 머신 사이트 추천A new species of armoured reptile that lived close to the time of the emergence of dinosaurs has been described by researchers.

The study was published in the journal, Zoological Journal of the Linnean Society.

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This archosaur fossil, which has bony plates on its backbone, shows that armour was a boomerang trait in the evolution of dinosaurs and pterosaurs. The group's ancestors had armour, but it was lost and later independently re-evolved numerous times in specialised dinosaurs like ankylosaurs and stegosaurs.

슬롯 머신 사이트 추천슬롯사이트œWe are just starting to understand that there were many dinosaur-like creatures across the planet well before dinosaurs evolved,슬롯사이트� said the study슬롯사이트™s lead author Sterling Nesbitt, associate슬롯 머신 사이트 추천professor of geosciences at Virginia Tech and a research associate in the American Museum of Natural History슬롯사이트™s Division of Paleontology. 슬롯사이트œDinosaurs were latecomers to the Triassic reptile party. They showed up well after many dinosaur-looking reptiles were established across our planet.슬롯사이트�

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Archosaurs are reptiles that are divided into two major branches: the bird line, which includes pterosaurs and dinosaurs, including living dinosaurs (birds); and the crocodilian line, including crocodiles, alligators, caimans, and gharials. The newly described archosaur species, named Mambachiton fiandohana, is the earliest diverging member of the bird line of archosaur evolution. The fossil, which is about 235 million years old, was found in 1997 in Madagascar by a team of researchers led by the Museum슬롯사이트™s Frick Curator of Fossil Mammals John Flynn, who worked at the Field Museum at the time, in close collaboration with scientists and students at the University of Antananarivo in Madagascar.

슬롯사이트œThis discovery documents the importance of the southern hemisphere fossil record in understanding this important period of the Triassic when dinosaurs were first appearing,슬롯사이트� Flynn said. 슬롯사이트œThis time interval is really poorly known elsewhere in the world, showing the tremendous value of our quarter-century-long Madagascar-U.S. research and education partnership to advancing scientific knowledge.슬롯사이트�

A four-legged, long-tailed precursor to dinosaurs and pterosaurs,슬롯 머신 사이트 추천Mambachiton슬롯 머신 사이트 추천is estimated to have been 4슬롯사이트�6 feet (1.5슬롯사이트�2 meters) long, weighing between 25슬롯사이트�45 pounds (10슬롯사이트�20 kilograms). Unexpectedly, the species had an extensive series of bony plates called osteoderms covering its backbone. Although osteoderms are common in crocodilians and their relatives, they are rare in bird-line archosaurs, with the exception of dinosaurs like stegosaurs, ankylosaurs, titanosaur sauropods, and at least one theropod.

Mambachiton shows definitively that the bird-line archosaur group was ancestrally armoured. This armour was lost in the evolution of dinosaurs and pterosaurs but then reappeared later several times, independently, in the dinosaur lineage.

슬롯사이트œThe loss and re-evolution of armour is an important aspect of the story of dinosaur evolution슬롯사이트”freeing them from some of the biomechanical body constraints of the ancestral archosaurs and potentially contributing to some of the locomotor shifts as dinosaurs diversified into a dizzying array of different ecology and body forms,슬롯사이트� said co-author Christian Kammerer, a former Gerstner Scholar at the Museum and a research curator in palaeontology at the North Carolina Museum of Natural Sciences.

슬롯사이트œMambachiton demonstrates that retention of ancestral features or acquisition of new traits depends on interactions within the ecosystem,슬롯사이트� said project co-leader Lovasoa Ranivoharimanana of the University of Antananarivo. 슬롯사이트œWhen a character is essential, it is retained, but when it is no longer useful, it disappears.슬롯사이트� (ANI)

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