Left: One of the small fossil teeth of Galagaon. Law: Gaga's Warrior. As noted, only the teeth of Galagadon remain. Its other parts of the body have long vanished, especially because the cartilage does not survive very well. Paleontologist Terry Gates, the lead author of the new research and lecturer at North Carolina State University, and his colleagues, concluded the size, shape and behavior of Galagadon by comparing their teeth with those of similar sharks "Fortunately, the shark teeth in our study show a close connection with living sharks, so we have reasonable insights into their ancient way of life," Eric Gorskak, paleontologist at the Field Museum and co-author of the new study, said Gizmodo. "Teeth are generally good indicators of diet for obvious reasons. These types of reconstructions are usually more difficult with other extinct animals, such as non-bird dinosaurs, as they differ significantly from most live animal analogues. "
The teeth of Gagamadon are less than a millimeter. so that they could easily be ignored. "It was so small you can miss it if you do not look very carefully," said Karen Norquist, a retired chemist and volunteer who helped find the teeth in the sludge. "For the naked eye just like a small boom, you need a microscope to see it well."
Nordquist was struck by the shape of these teeth, which reminded her of the spacecraft in
Galaga . Her colleagues evaluated the comparison and decided to name the shark after the classic videogame and the Nordquist itself
Galgadon's assortment of teeth.
Galgadon and T. Rex as contemplated by this discovery, were contemporaries. The discovery of freshwater shark in this part of the world, however, is a challenge to the conventional thinking of the South Dakota environment at that time. Sue was believed to have lived and died near a lake formed by a fading river, but the existence of Gagamadon suggests that the region is connected to the sea, perhaps by a river, allowing sea sharks to moving inland and developing capacity to live in fresh water. "It may seem strange today, but about 67 million years ago, what is now South Dakota has been covered with forests, swamps and curved rivers," Gates said in a statement. Galagadon did not descend to the prey of T. rex Triceratops or other dinosaurs that happened in his streams. This shark had teeth that were useful for catching small fish or chopping snails, and [crayfish].
The discovery is important because it will help scientists understand the diversity and potential dynamics of ancient ecosystems, especially in the context of non-bird dinosaurs such as the world-famous Sue
T. rex "said Gorskak. "The sharks described in our book help the evolutionary story of modern shark carpets, a group of sharks currently living around Southeast Asia and Australia, but now we know we have a greater reach in our history for millions of years."  Future discoveries can shed more light on Gadamedon and its habitat, but so far, the discovery of an ancient shark in the same sedge, where Sue is located T. rex seems unjustifiably appropriate.
[Journal of Paleontology]