Related how?

Biota (Life)
Prokaryotes (Prokaryota)
Archaea (Archaebacteria)
Euryarchaeota
Methanomicrobia
Methanosarcinales

Methanosaetaceae (4044138)

Children (2 direct children, 11 direct and indirect children):

Methanosaeta (tree size 5)

Methanothrix (tree size 4)