Sunday, September 9, 2012
Class trilobites are extinct arthropods that lived in ancient seas on Earth. They appear in the Cambrian and lived during the Paleozoic low before gradually die. The last trilobites disappeared in a mass extinction at the end of the Permian 250 million years ago. Trilobites disappear even before the existence of dinosaurs and is one of the key things in the Paleozoic Era, the first era in which the spread of complex life forms.Although dinosaurs are some of the best-known fossil animals, trilobites were among the favorite fossils for collectors and people familiar with Paleontology. Trilobites can be found in the rocks of each kontinetite.Trilobitite are very well known species of fossils and perhaps the second known fossil group after the dinosaurs. They are one of the most diverse group of animals in the fossil register consisting of nine orders and over 15,000 species. Currently trilobites are listed with Helitserovi group Arachnomorpha.Most of them were simple small marine creatures filtered mud to eat. Inhabited the ancient sea basins. On the dorsal side were hard Chitin Shield. It is divided into three parts: Glavova Department (Cefalonium) body section (Thorax) and caudal section (pigidium).