Trilobites were marine arthopods, from the group Trilobita, with more than 10 thousand species some growing to 2 metres. The group Trilobita appeared in the Cambrian Period (520 million years ago) until the end of the Permian Period (250 million years ago).The name Trilobita is derived from the three (tri-) lobed structure of the exoskeleton, which has a raised central lobe (or axis) and a pair of side lobes, called pleurae. The trilobite body is also divided lengthwise into three regions : a head or cephalon, a middle region (thorax) composed of several to many articulated segments, and a tail plate called a pygidium, which consists of fused segments. Arthropods are the most species-rich animal phylum living today, and have been the most diverse group of multicellular animals since the Early Cambrian.
Their main subgroups are the crustaceans (like prawns and crabs), the chelicerates (including spiders, scorpions, and mites), and the wholly terrestrial groups Insecta and Myriapoda (the latter including millipedes and centipedes). This item is in the category "Collectables\Rocks, Fossils, Minerals\Fossils". The seller is "earthstonesoz" and is located in this country: AU.
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375 Millions of Years Old