World problems

Title
Extinct species of Pelycosauria
Extinct species of Embrithopoda
Extinct species of Archipolypoda
Extinct species of Araeoscelidia
Extinct species of Prolecanitida
Extinct species of Archaeosuchia
Extinct species of Paracrinoidea
Extinct species of Amphichelydia
Extinct species of Kustarachnida
Extinct species of Trilobitoidea
Extinct species of Megasecoptera
Extinct species of Rostroconchia
Extinct species of Perielytrodea
Extinct species of Temnospondyli
Extinct species of Tarrasiiformes
Extinct species of Ambiortiformes
Extinct species of Arthropleurida
Extinct species of Endoceratoidea
Extinct species of Parablastoidea
Extinct species of Hexanthiniaria
Extinct species of Cyclocystoidea
Extinct species of Protoaviformes
Extinct species of Luganoiiformes
Extinct species of Protelytroptera
Extinct species of Proganochelydia