Acanthostega Anomalocaris Anteosaurus Apthoroblattina Arthropleura Asilisaurus Astraspis Birkenia Bothriolepis Brontoscorpio Burgessomedusa Cacops Cameroceras Cephalaspis Charnia Coelurosauravus Cotylorhycnhus Crassigyrinus Diadectes Dickinsonia Diictodon Dimetrodon Diplocaulus Drepanaspis Dunkleosteus Edaphosaurus Edestus Entelognathus Eryops Erythrosuchus Estemmenosuchus Euchambersia Euparkeria Eurypterus Eusthenopteron Falcatus Gorgonops Guiyu Haikouichthys Hallucigenia Helicoprion Hibbertopterus Hylonomus Hyneria Hynerpeton Ichthyostega Inostrancevia Isotelus Jaekelopterus Jonkeria Kimberella Lycaenops Lystrosaurus Materpiscis Megalograptus Megamastax Meganeura Moschops Nectocaris Nyasasaurus Opabinia Ophiacodon Paradoxides Petrolacosaurus Phlegethontia Pikaia Prionosuchus Proterogyrinus Proterosuchus Pteraspis Pterygotus Pulmonoscorpius Rhinesuchus Scutosaurus Secodontosaurus Seymouria Spriggina Stethacanthus Tambacarnifex Tetraceratops Thrinaxodon Tiktaalik Titanichthys Tullimonstrum Varanops Walliserops Wiwaxia Xenacanthus