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Trilobites

The ancestors of Arachnida and Crustacea belonged to the class Trilobita.

Biology

Keywords

Trilobita, trilobite, fossil, extinct, prehistoric creature, index fossil, Palaeozoic Era, Palaeozoic, Cambrian period, sea creature, chitin layer, chitin, armour, arachnids, cancer, animal, arthropod, arthropods, biology

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