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Trilobites (Cambrian Period, coming from the USA), very ancient arthropods, that appeared at the beginning of the Cambrian Period (570 million years ago), which became completely extinct at the end of the Permian Period (245 million years ago) with the first great mass extinction. Sea organisms that colonized all the ecological niches, their name derives from the fact that their body is divided into three parts : one in the front, cephalon, equivalent to the head, one in the middle the thorax, characterized by numerous segments, and one at the back the pygidium, a kind of “tail”. Photograph by Paola Tognini

Eni S.p.A. - P.IVA 00905811006