World problems

Title
Extinct species of Pholidophoriformes
Extinct species of Ellimmichthyiformes
Extinct species of Calyptoptomatida
Threatened species of Monoplacophora
Extinct species of Spongiomorphida
Extinct species of Rhombifera
Extinct species of Blastoidea
Extinct species of Eocrinoidea
Extinct species of Diploporita
Extinct species of Homoiostelea
Extinct species of Ctenocystoidea
Extinct species of Edrioblastoidea
Extinct species of Helicoplacoidea
Threatened species of Myricales
Threatened species of Hemimastigophora
Extinct species of Proanura
Extinct species of Rhamphorhynchoidea
Extinct species of Protomedusae
Extinct species of Dipleurozoa
Extinct species of Tillodontia
Threatened species of Pentastomida
Threatened species of Mystacocarida
Threatened species of Megaloptera
Threatened species of Mytiloida
Extinct species of Xenungulata