Lead researcher Dr Martin Brazeau, from the Department of Life Sciences at Imperial, said: “It was a very unexpected discovery. The team published their findings today in Nature Ecology & Evolution. This could suggest the ancestors of sharks first evolved bone and then lost it again, rather than keeping their initial cartilaginous state for more than 400 million years. Now, an international team led by Imperial College London, the Natural History Museum and researchers in Mongolia have discovered a fish fossil with a bony skull that is an ancient cousin of both sharks and animals with bony skeletons. Cartilaginous skeletons are known to evolve before bony ones, but it was thought that sharks split from other animals on the evolutionary tree before this happened keeping their cartilaginous skeletons while other fish, and eventually us, went on to evolve bone. Sharks have skeletons made cartilage, which is around half the density of bone. here is clear evidence of bony inner skeleton in a cousin of both sharks and, ultimately, us. The discovery of a 410-million-year-old fish fossil with a bony skull suggests the lighter skeletons of sharks may have evolved from bony ancestors, rather than the other way around. Coloring book, others, white, mammal, face png 800x800px 54.Sharks’ non-bony skeletons were thought to be the template before bony internal skeletons evolved, but a new fossil discovery suggests otherwise.Marlin fishing Atlantic blue marlin Computer Icons, nature sea animals shellfish, angle, animals, sports Equipment png 512x512px 6.9KB.Goldfish Coloring book, fish, white, animals, leaf png 2000x1461px 179.46KB.The Rainbow Fish Printing and writing paper Outline, Cute Fish Outline, template, white, text png 1236x1600px 375.27KB.Fly fishing Drawing Fishing Rods, Graduation Cap Drawings, white, mammal, hand png 788圆55px 390.24KB.Yacht Sailboat Sailing ship, Ship Outline, caravel, monochrome, vehicle png 800x781px 127.27KB.Bass fishing Largemouth bass, Bass Outline s, white, mammal, text png 600x546px 102.47KB.Walrus Drawing Line art, Animal Outlines, marine Mammal, white, mammal png 5296x4120px 152.15KB.51st parallel north 45th parallel north 30th parallel north 49th parallel north 47th parallel north, black outline of a fish, white, marine Mammal, mammal png 550x407px 47.33KB.Beluga whale Outline, Whale Outline s, love, white, monochrome png 600x458px 26.06KB.Common bottlenose dolphin, Dolphin, marine Mammal, mammal, animals png 7652x5419px 532.17KB.Computer Icons Recreational fishing Angling, Fishing, text, sport, logo png 500x500px 6.98KB.Mister Seahorse Coloring book Child, seahorse, white, child, animals png 598x963px 37.34KB.Fish as food, Tropical Line s, angle, white, food png 1979x1979px 86.83KB.Drawing Sailboat Sailing ship, Ship Outline, caravel, monochrome, dromon png 800圆62px 149.43KB.maple leaf illustration, Sugar maple Maple leaf Outline, Fish Outline Template, angle, white, maple png 800x800px 184.15KB.Seahorse Line art, Sea Horse Outline, monochrome, vertebrate, head png 3951x7351px 255.83KB.koi fish logo template black white dynamic outline, png 2981x3207px 168.98KB.japanese koi fish icons dynamic flat black white handdrawn outline, png 3000x2200px 82.46KB.Goldfish Orange, Black Outline Of A Fish, marine Mammal, food, orange png 600x450px 20.2KB.Great white shark Lamniformes Hammerhead shark Tiger shark, black outline of a fish, angle, white, logo png 640x320px 40.72KB. ![]() japanese koi fish icon dynamic black white handdrawn outline, png 3000x2211px 105.75KB.dori finding nemo fish black white outline, png 1829x1764px 83.36KB.ocean fishes black white outline, png 3246x3357px 204.12KB.Starfish Black and white Drawing, Fish Drawing Outline, angle, symmetry, monochrome png 5364x5205px 237.76KB. ![]()
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