Baptized with the poetic name of "a giant thunder at dawn", Ledumahadi Mafube in sesotho language, experts have described a new species of sauropod dinosaur, found in South Africa, where it lived 200 million years ago and was a close relative and ancestor of the brontosaurus. The remains found belong to an adult specimen, about 14 years old, and may have weighed about 12,000 kilos, according to a study published by Current Biology. The new dinosaur walked predominantly on all fours, thus anticipating, during the Jurassic, the displacement system that would later perfect the brontosaurus and his fellow humans. One of the authors of the study, Jonah Choiniere of the University of Witwatersrand in Johannesburg, pointed out that this finding shows that "200 million years ago, these animals had become the largest vertebrates that have walked the Earth. Choiniere said, in a statement, that understanding the biology of these animals using only fossil records "is extremely difficult," so they used other methods to discover some of their characteristics. In this way, to determine if he walked on two legs, like his predecessors, or on four, they developed a method using measurements of current animals and measuring the thickness of the dinosaur's extremities to infer its weight and how many legs would have held that weight. Thus, the results suggest not only that the Ledumahadi mafube was quadruped, but that many other early sauropods were "experienced" in the art of four-legged walking, which had arisen from species that moved only with their hind legs. Choiniere said that the evolution of sauropods is not as simple as we thought. In addition, according to the expert, these findings show that millions of years before the tyrannosaurus or velocirpator appeared in the northern hemisphere, there was already "a prosperous ecosystem of dinosaurs in South Africa," where "12-ton giants like the Ledumahadi, tiny canivores like the megapnosaurus, and the first mammals lived.
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68 million years ago there was a monumental frog the size of an inflatable beach ball with a bite so powerful that it was capable of hunting and devouring small dinosaurs back in the Late Cretaceous. It is Beelzebufo ampinga and is undoubtedly the largest frog known to date, according to the study published by a team of scientists from California Polytechnic State University in Pomona (California) and the University of Adelaide (Australia) in the journal Scientific Reports.
Using their similarities to today's Ceratophrys frogs, scientists have detailed the past of this bulky amphibian, which was much larger than any frog we can see today. Also known as 'devil frog', Beelzebufo ampinga was more than 40 centimeters long and weighed about 4.5 kilograms. She was dressed in a powerful armor (ampinga) and a herculean, wide jaw. Scientists believe it must have been the largest frog ever seen. Similar to today's Ceratophrys frogs (commonly known as Pac-Man frogs because of their round body and wide mouth, similar to the character of the well-known video game), experts used knowledge about them to determine the strength of the bite of the ancient Beelzebufo. They used a custom-made force transducer with two leather-covered plates. When the frog bites on the plates, the force of the bite can be accurately detected. A modern Ceratophrys frog, with a head width of 4.5 centimeters, has a bite force of 30 Newtons, or approximately 3 kilograms. This allows the frog, once it has captured its prey with its sticky tongue, to secure the food firmly in motion between its powerful jaws, squeezing it and making it impossible for it to escape. Its name means: beelze = devil, in Greek, bufo = toad, in Latin and ampinga = shield. "Unlike the vast majority of frogs that have weak jaws and habitually consume small prey, horned frogs ambush animals as large as themselves - including other frogs, snakes and rodents, and their powerful jaws play a critical role in grabbing and dominating the prey," comments Marc Jones, co-author of the paper. The scaling method used to determine the bite force of these frogs, linking the bite force to body and head size, is also consistent with the results found for other animals, including fish, reptiles, and rodents. Thus, by extrapolating the bite force results to the size of Beelzebufo's mouth, about 15.4 centimeters wide, the scientists identified a bite force of up to 2,200 Newtons (about 224 kg). That is, the force of their bite would be comparable to that of today's tortoises. A new method of genetic reconstruction creates a chicken embryo with a muzzle and a palate similar to that of the velociraptor.
Have you ever wondered if it would be possible to bring dinosaurs back to life? After the recent release of Jurassic World's sequel, T-REX and Velociraptor are back on everyone's lips. More than 11,000 species of modern birds, from owls and falcons to robins and charcoal burners, are the direct descendants of dinosaurs. The whole evolutionary process after its extinction is now history. To understand the historical context, we must take into account the discovery of the Archaeopteryx in 1864, whose existence dates back to the Upper Jurassic. |
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January 2019
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