Fig. 2

Phylogenetic classification of the Bathyarchaeota MAGs ATB-1, -2, -3, -4, and -5 originating from thermophilic and mesophilic biogas-producing microbial communities. The phylogenetic tree is based on all core genes of the selected strains and MAGs from the phyla Euryarchaeota, Korarchaeota, Crenarchaeota, Aigarchaeota, Thaumarchaeota, and Bathyarchaeota as determined by means of phylosift [46, 47] and RAxML version 8.1.16 [30]. Red-colored lines indicate a 100% support, orange tones accordingly less. BA1, BA2: MAGs determined for samples from coal-bed methane wells within the Surat Basin, Australia [10]; RBG_16_48_13, RBG_13_60_20, RBG_13_38_9, RBG_13_46_16b, RBG_16_57_9, RBG_13_52_12: MAGs determined for groundwater and sediment samples from an aquifer adjacent to the Colorado river near Rifle, USA [35], SG8-32-1, SMTZ-80, DG-45, AD8-1, SG8-32-3, SMTZI-55: MAGs determined for sediment core samples of the White Oak river, USA [34, 48,49,50]; further details on the MAGs are given in Additional file 2. The Euryarchaeota was chosen as outgroup. The bar represents the scale of sequence divergence