There are also Loriciferans, three species of which live in completely anoxic environments. https://en.wikipedia.org/wiki/Loricifera#In_anoxic_environments htt

There are also Loriciferans, three species of which live in completely anoxic environments. https://en.wikipedia.org/wiki/Loricifera#In_anoxic_environments https://en.wikipedia.org/wiki/Loricifera#In_anoxic_environme...