Orthocerida is an order of extinct Orthoceratoid cephalopods also known as the Michelinocerda that lived from the Early Ordovician (490 million years ago) possibly to the Late Triassic (240 million years ago). A fossil found in the Caucasus suggests they may even have survived until the Early Cretaceous (150 million years ago). They were most common however from the Ordovician to the Devonian. - Wikipedia (en), 16.07.2017
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