World problems

Title
Extinct species of Hybodontiformes
Extinct species of Ophiocistioidea
Extinct species of Merismoconchida
Extinct species of Palaeocaridacea
Extinct species of Scleromorpharia
Extinct species of Copodontiformes
Extinct species of Edrioasteroidea
Extinct species of Dorypteriformes
Extinct species of Pterodactyloidea
Extinct species of Kilbuchophyllida
Extinct species of Labyrinthodontia
Extinct species of Galeaspidiformes
Extinct species of Euthycarcinoidea
Extinct species of Pachycormiformes
Extinct species of Redfieldiiformes
Extinct species of Praeornithiformes
Extinct species of Anthracocaridacea
Extinct species of Petalodontiformes
Extinct species of Gobipterygiformes
Extinct species of Limnornithiformes
Extinct species of Pygocephalomorpha
Extinct species of Ctenacanthiformes
Extinct species of Alexornithiformes
Extinct species of Iniopterygiformes
Extinct species of Cladoselachiformes