What are some Silurian organisms?

Silurian organisms lived during the Silurian period, which lasted 443.7 and 416 million years ago. Silurian is the shortest geological period except for neogen with a total length of only 27.7 million years. On the other hand, the Cretaceous period took 80 million years. The Break period occurred immediately after the Ordovica and just before Devonian. The beginning of Silurian is defined by a number of extinct events, so serious that they deleted 60% of all animals, the second largest mass demise in history. Extended to a length to 2 m (6.5 ft) and the earliest well -developed earthly flora and fauna, including vascular plants and terrestrial arthropods such as mills, mites, harvesters, springs, springs and SP and Spides.

Silurian was the beginning of a warm period that took more than a hundred million years. Continental glaciers slowly retreated and disappeared in the middle of the period, opening huge warm, shallow sea for various fish, echidnoderms (starfish, sea lili and relatives), nautiloids, trilobites, molluscs, brachiopods, eurypterids and crustaceanse. The sea fauna throughout Silurian was more in a period of diversification than any basic innovation.

Much of the evolutionary event of Siluriana, from our informal point of view, took place on the ground. Although there were simple thumb, non -accurate plants similar to liver and moss, the first real vascular plants occurred during the second half of Silurian and determined the soil for the first extensive colonization of soil through plants. Vascular plants contain specifications of tissues for movement around water and nutrients, allowing plants to grow much higher than they have proved. The first vascular plants, such as Cooksonia , were only a few centimeters tall, but formed the basis for miniature ecosystems that included the above -mentioned game of early earthly arthropods. First, the well -known fossil of the earthly animal is the fossil of Millipede dated 428 million years ago.