A maximum likelihood tree based on 243 Methanomassiliicoccales genomes, including 33 MAGs and two cultured strains from this study, was inferred from a concatenated set of 118 archaeal marker proteins. The gray triangle corresponds to the five outgroup taxa from the order Thermoplasmatales. Support values > 80% are shown as black dots. Stars on the clade represent the genomes reconstructed in this study and publicly available cultured genomes, whereas unmarked clades represent MAGs retrieved from previous studies. Colored strips on the two outermost rims show the biome type to which the isolation belongs and the animal source of the host-associated genomes. Two layers of the concentric bar plot indicate the genome size (G.S.) and the corresponding assembled completeness (Com.).