World problems

Title
Extinct species of Ichthyosauria
Extinct species of Anagalida
Extinct species of Notopterna
Extinct species of Apatotheria
Extinct species of Tegotheridia
Extinct species of Eupantotheria
Extinct species of Astrapotheria
Extinct species of Multituberculata
Threatened species of Acarpomyxea
Threatened species of Plumbaginales
Threatened species of Colpodida
Threatened species of Acrasea
Threatened species of Entodiniomorphida
Threatened species of Enteropneusta
Threatened species of Planctosphaeroidea
Threatened species of Ascidiacea
Threatened species of Aconchulinida
Extinct species of Conchyliocarida
Threatened species of Hydroida
Threatened species of Bivalvulida
Threatened species of Phyllocarida
Threatened species of Remipedia
Threatened species of Pteromedusae
Threatened species of Ostracoda
Threatened species of Nyctereutes