User:PrehistoricManiac08/2From Wikipedia, the free encyclopedia 360MYA - 300MYA Hynerpeton 360MYA Stethacanthus 360MYA Dunkleosteus 360MYA Bothriolepis 360MYA Petrolacosaurus 300MYA Arthropleura 300MYAArthropleura 300MYA Meganeura 300MYA Proterogyrinus 300MYA Crassigyrinus 300MYA Synapsid Rule
360MYA - 300MYA Hynerpeton 360MYA Stethacanthus 360MYA Dunkleosteus 360MYA Bothriolepis 360MYA Petrolacosaurus 300MYA Arthropleura 300MYAArthropleura 300MYA Meganeura 300MYA Proterogyrinus 300MYA Crassigyrinus 300MYA Synapsid Rule