What was the well -known one of the earliest complex animals?

The first multicellular complex animals of any kind appear in the fossil record about 600 to 590 million years ago, specifically in the formation of Twitya in the Canadian Mackenzie. These are simple cup -shaped animals that appear in fossil form like simple impressions on the disk and ring. It is assumed that they correspond to simple Cnidarians (related jellyfish) or sponges. Because they are so simple, these fossils provide little information about the animals that has made them. However, they are still considered “complex” due to their very large size (about an incense on average) compared to simpler microscopic unicellular fossils from before and next to them. The wide range of fossil embryos, as well as the most timely known bilateral animal, 0.1 mm Vernanimacula (about 590 to 600 mya), a "small spring animal", a small ball-shaped animal with what seems to be fossilized, as well as surface pits that may be sensory structures. DroBidna fossil embryos of complex animals, such as Cnidarian, are preserved in an unrivaled degree of detail in Doushantuo, giving paleontologists an important insight into the earliest known embryos.

Another early fossil among complex animals is mysterious clouda , a segmented fossil consisting of calcite cones on top of each other. Measured in millimeters additions, these fossils are among the first known shells in fossil record. They show beginners, suggesting that they have reproduced and also predatory boring, which shows that predators were even in the dawn of the well -known multicellular life. Like many of the first fossils, there is no uncertainty about what exactly was Cloudina - the current view is divided by Betwmyslenka, that the sample is a group of tribal groups and that any classification, even at the level of phylum, is unreasonable. They can be archaeocyathides, ancientMushrooms that built cliffs hundreds of millions of years before the development of corals.

The first truly "complex animals" (greater than 1 mm, not Cnidarians or corals) are fossils about 575 million years old and are found in the assembly of a misconception in Newfoundland, Canada. Absolutely the oldest is Charnia Wardi , a people in the shape of a people with left and right alternating combs. Since these combs are not completely symmetrical around the central axis, Charnia is not a real bilateral organism and can only be described as semi-philaterial. Scientists initially described as the first relative of the sea pen, now they simply have no idea how to classify Charnia