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New prehistoric species of sharks found together with Sue T. Rex | science



Dinosaurs tend to dominate our vision of the past. However large and impressive they have been in life, they are even greater in our imagination. But much more than the "terrible lizards" lived and flourished during the Mesozoic era, and some of the creatures that lived with the dinosaurs actually had a striking resemblance to today's animals. Sharks, for example, are part of the most successful creatures that ever lived. Their fossil data is about 400 million years old and includes ancient species, both strange and familiar. A new find contributes to the long-term legacy of these sea-birds. The fossil teeth of sharks have recently been discovered along with the bones of the most famous and complete T. The rex skeleton that has ever been found helps to fill out a more detailed picture of life in the last days of dinosaur management.

The small teeth, the petrified petals around the head, look straight from the 1

980s video game. They walked on a tour of the discovery that began with the excavations of the nearly Tyrannosaurus known as Sue as early as 1990 As the tyrannosaurus bones were removed from the ground, the encircling rock, called the matrix, remained around the bones to be safe until more detailed preparatory work was done. The field museum in Chicago, where Sue lives today, saved the matrix for future screening and exploration. Almost three decades later, these efforts gave the small teeth of a shark floating upstream along the rivers to live in Sue's neck.

This shark lived at the same time as Sue, T. Rex, part of the same world, "says Pete Makowitzky, field museum curator of the Field Museum and one of the authors of the study describing the new species in a press release . "Most of his body is not preserved, as shark skeletons are made of cartilage, but we have found its small fossil teeth."

  Galagadon </i> named for the shape of his teeth, which resembles the spacecraft in the Galaga video game.</p>
<p><span class= (Terry Gates) Paleontologist at the University of North Carolina Terry Gates guides work on the characterization of new species of sharks in Journal of Paleontology . An appropriate name for the ancient shark immediately became clear to the researchers. Each of the small, triangular teeth resembles the constant space invaders in the classical arcade of 1981 Galaga . Thus, Gates and his colleagues called the shark the Georgian Gagaladon as the name of the species also honored the volunteer of the Karen Norwicht Museum to find the first fossil tooth. "I'm looking very carefully," Nordquist said in a press release. "For the naked eye just like a small boom, you need a microscope to see it well."

Based on comparisons with other fossil shark teeth, the team suggests Gagalamon belonged to a large family of sharks called orectolobiformes, or carpet sharks. Paleobiologist at DePaul Kenshu Shimada University agrees with this identification. Gagamadon says, "serves as another example of diversification of this group of sharks not only in the oceans of the world but also in the freshwater systems in the earth's environment near the end of the so-called" Reptilian Era. "While only the teeth of Galagadon are known, their form implies that the living animal would look like today's bamboo sharks, a subset of carpet sharks found in the warm waters of Indo.

What intrigued paleontologists about Gagamadon however, is what the shark can reveal to the world in which Sue is melting. "The new study, including the recognition of new species, sheds light on the complex evolutionary history of the freshwater system that existed in North America when

Although dinosaurs often dominate the spotlight, species that help paleontologists reconstruct what the ancient environments were. Smaller animals such as frogs, turtles, and fish can help narrow the details of ancient habitats such as climate and waterway systems.

So far it seemed that Sue's body was deposited in a lake created by a nearly-dried river. It is considered to be a relatively independent habitat. But the presence of a species of shark known only in the ocean environments indicates that the river was probably connected to the sea, allowing Gadamedon and other species to swim inland. Without the shark's teeth, paleontologists would miss this water link. Whether Galagadon moves into a formation like its own videogames, it will still have to wait for future finds

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