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Trilobite Orders::




The Trilobita

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Proetus sp.

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The Arthropoda

The Arthropoda, including more than 1 Million species, representing the division with the most diversity of forms of presence. Due to their Ordovician, the Arthropoda (arthropods)are part of the ancient and ever succeeding group of invertebrates, whose marine representatives already populated Early Cambrian oceans. Started from early Cambrian, trilobites prime- age outlasted until the end of Late Ordovician. Regarding the periods Cambrian, Ordovician and Silurian, Trilobites biostratigraphical constituting significant key fossils. Starting at the ending of Upper Ordovician until Permian, there was a steadily decreasing of the representatives of Trilobita regarding diversity and numerical abundance. With the mass extinction at Permian's end, appreciately 75- 90% affected species of Animalia, Trilobita finally going down as extinct class of Arthropoda.

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