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TRILOBITES ARE AN EXTINCT GROUP OF MARINE ARTHROPODS THAT LIVED DURING THE PALEOZOIC ERA , RUOGHLY FROM THE CAMBRIAN PERIOD ABOUT 521 MILLION YEARS AGO TO THE END OF THE PERMIAN PERIOD ABOUT 252 MILLION YEARS AGO . THEY ARE AMONG THE MOST WELL KNOWN AND STUDIED FOSSILS , WHIT OVER 20,OOO SPECIES DESCRIBED

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PHACOPS

phacops is a  genus of trilobites

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GERASTOS

gerastos is genus of trilobites ,belonging to the order phacopida

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THYSANOPELTIS

thysanopeltis is an extinct genus of trilobites ,a group of early marine 

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HOLLARDOPS

hollardops is genus of trilobites

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PARALEJURUS

paralejurus is an extinct genus of trilobites

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CROTALOCEPHALUS

crotalocephalus is an extinct genus of trilobites 

ENROLLED

enrolled is a  genus of trilobites

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CORNUPROETUS

cornuproetus is genus of trilobites ,an extinct group of marine arthropods

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AMMONITES

ammonites  is an extinct groups of marine animals

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LEONASPIS

leonaspis is genus of trilobites 

CYPHASPIS

cyphaspis is genus of trilobites