What is the evolutionary fish history?

"Fish" is a word used to indicate any non -etrod vertebrate. Evolutionary fish history began 530 million years ago, in the middle of the Cambrian period. Some of the oldest known animals in the evolutionary history of fish are Pikiaia gracilens, which resembles a modern congot, found in the famous Burges Slate Assembly and Haikouichthys Myllocunmingia by Maotianshan Shales of Southern China. These simple fish without a jaw existed for about 100 million years until the first jaws have developed. These are also the oldest known vertebrates.

Initially, fish were members of a minority in an ecosystem dominated by invertebrates, especially brachiopods, mushrooms and arthropods such as trilobites. It would not be until the Silurian period, about 420 million years ago, which developed jaws and began to compete effectively with the invertebrates. The earliest jaws were placoderms, the family of fish with a special head and chest Armor to protect them from predators. These fish jSouns of ancestors of all modern vertebrates, including humans and all our domestic animals and livestock. Sometimes these animals do not consider themselves real fish because of their radically different physiology. There is even some disagreement about whether lamps are vertebrates at all, because their cartilage "skeleton" is so primitive.

Evolutionary fish history continued with the dominance of headlapping fish, especially placoderma, which grew up to 6 m (20 ft) for supercar, such as dunkelosteus Teleleri . Great predators as dunkelosteus are considered the first vertebrate superparers and firmly determined the role of vertebrates as Apex Predators in the world with ecosystems, a role that would continue in the rest of evolutionary history. Placedermy dominated during the Silurian period, several tens of millions of years, up to the Devonian, when the fish began to diversify rapidly.

Devon was the greatest milestoneIn the evolutionary history of fish, when many modern and extinct forms have evolved from Placoderm seed, including sharks and beams, acantodians ("barbed sharks", now extinct), beam fish), and fish that eventually evolved on field double -sided. Fish have successfully performed many other marine organisms to become a dominant mobile sea animal and share the sea with small arthropods such as Copepods and Krill.

Although the fish with lobe and acanthodians proved to be largely died into the end of the next period, Carbonian, while the lobe fish became minor minors after the creation of tetrapods during the same geological period. For many years it has been expected that only Lungfish was represented until Colacanth was withdrawn from the coast of South Africa. The discovery of the living coelacanth was considered one of the largest zoos of the 20th century.