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The Devonian period (419–359 Mya), also known as the Age of Fishes, saw the development of early sharks, armoured placoderms and various lobe-finned fish, including the tetrapod transitional species. The evolution of fish began about 530 million years ago during the Cambrian explosion.
End Ordovician: 440 million years ago, 86% of all species lost, including graptolites; Late Devonian: 375 million years ago, 75% of species lost, including most trilobites; End Permian, The Great Dying: 251 million years ago, 96% of species lost, including tabulate corals, and most trees and synapsids
The oldest total-group chondrichthyans, known as acanthodians or "spiny sharks", appeared during the Early Silurian, around 439 million years ago. [13] The oldest confirmed members of Elasmobranchii sensu lato (the group containing all cartilaginous fish more closely related to modern sharks and rays than to chimaeras) appeared during the ...
The shark is believed to be an ancestor of the great white shark. ... Peruvian paleontologists in November presented the fossil of a young crocodile that lived more than 10 million years ago off ...
Get excited for the 35th official Shark Week, from July 23 to July 29, with these shark facts. Sharks are millions of years older than dinosaurs and 5 other facts that may surprise you Skip to ...
The two recently identified shark species were up to 12 feet long and once lurked in what is now Kentucky. Teeth in walls of Kentucky cave belong to sharks that lurked 325 million years ago Skip ...
Cretoxyrhina mantelli was a large shark that lived about 100 to 82 million years ago, during the mid Cretaceous period. It is commonly known as the Ginsu Shark. This shark was first identified by a famous Swiss Naturalist, Louis Agassiz in 1843, as Cretoxyhrina mantelli. However, the most complete specimen of this shark was discovered in 1890 ...
Molecular clock studies published between 1988 and 2002 determined the closest living relative of the great white to be the mako sharks of the genus Isurus, which diverged some time between 60 and 43 million years ago. [28] [29] Tracing this evolutionary relationship through fossil evidence, however, remains subject to further paleontological ...