Robuta

https://pmc.ncbi.nlm.nih.gov/articles/PMC39006/ A psychrophilic crenarchaeon inhabits a marine sponge: Cenarchaeum symbiosum gen. nov., sp. nov -... Archaea, one of the three major domains of extant life, was thought to comprise predominantly microorganisms that inhabit extreme environments, inhospitable to... marine spongecenarchaeum symbiosumpsychrophiliccrenarchaeon