What were the first animals to go on the ground?
The first animals that walk on the ground are not known. There is evidence that the arthropods of soft body and slug visited the land 510 million years ago in the Cambrian era and left behind the mysterious traces called Climactichnites and diplochnits . These traces are mysterious because no fossils were found in the animals that made them. Some of these trace fossils are as wide as four inches. Perhaps these animals did not bother air and only for a short time on the ground only moved on the ground as a way of crossing from the pond to the pond.
According to scientific consensus, the first verified land animal was a disposable myriaffoda. Today's examples of Myriapods include Millipedes and Centipedes. This myriapod, discovered in 2003 in Scotland and named Newmani pneumodesm, is dated 428 million years ago. Paleontologists can say that he lived on the ground because his fossil shows that he has spirals; holes that insects, spiders, rays to the height uses for respiratory vzspirit. Before the discovery of Newmani, the oldest known air was breathing by organism similar to spiders 410 million years ago.
The first animals with a rope that behave land are often incorrectly cited as Devonian temporary forms called "fishponds" because they are medium between fish and real tetraps. An example is the Fish ticalik , who lived 375 million years ago, during the Devonian period. It is remarkable that such organisms are so often cited as the first land animals, when land animals more than 50 million years ago, for example Newmans are now known. The effect may have something to do with the bias in favor of the more well -known vertebrates over the invertebrates.
The earliest ground animals probably lived in shallow pools poor in oxygen near the ground. As the first vascular plants evolved, Would suffocated the area around these poolséne weed, so it is evolutionary to rise to them and around them with fast raids on the ground area. At that time, the Earth would be much richer in nutrients than water, because the plants colonized the soil in front of the animals and left a crumbling plant everywhere. Bacteria and fungi mostly decomposed from plant matters, but it would still be attractive to hungry fish. About 365 million years ago, some fish (so -called "Fisheps") developed the limbs and climbed on the ground. The appearance of the first real trees about 370 million years ago would help together, by putting more nutrients in the soil and reinforcement of the environment.