Table S2.
Genomes screened for the presence of MCOs
| No. code | Genus and species | Strain | Taxon identification |
| BEOBS1 | Thaumarchaeota archaeon | BS1 | IMG_2502957026 |
| BEOBS4 | Thaumarchaeota archaeon | BS4 | IMG_2519899514 |
| NFN1 | Thaumarchaeota group 1.1c | (bin Fn1) | |
| CAERO | Calditenuis aerorheumensis | ?? | IMG_2545555825_21516 |
| CSUB | Caldiarchaeum subterraneum | ?? | BA000048 |
| DRAGT | Thaumarchaeota archaeon | DS1 | IMG_2263082000 |
| CENSY | C. symbiosum | A | NC_014820.1 |
| CSP1 | Thaumarchaeota archaeon | CSP1 | LDXL00000000.1 |
| NADR | Nitrosopumilus adriaticus | NF5 | CP011070.1 |
| NBREV | N. brevis | CN25 | CP007026.1 |
| NCHUN | Nitrosotenuis chungbukensis | MY2 | AVSQ00000000 |
| NDEVA | N. devanaterra | Nd1 | LN890280.1 |
| NEVER | N. evergladensis | SR1 | CP007174.1 |
| NEXA | Nitrosocosmicus exaquare | G61 | (MAGE) |
| NGAR | N. gargensis | Ga9.2 | CP002408.1 |
| NIKO | N. koreensis | MY1 | NZ_AFPU00000000 |
| NISA | Nitrosopumilus salaria | BD31 | NZ_AEXL00000000 |
| NKOR | Nitrosopumilus koreensis | AR1 | CP003842 |
| NLIBG20 | Nitrosoarchaeum limnia | BG20 | GCF_000241145.1 |
| NLIM | Nitrosoarchaeum limnia | SFB1 | CM001158.1 |
| NMAR | N. maritimus | SCM1 | CP000866.1 |
| NOLEO | Nitrosocosmicus oleophilus | MY3 | CP012850.1 |
| NPIR | Nitrosopumilus piranensis | D3C | CP010868.1 |
| NSED | Nitrosopumilus sediminis | AR2 | CP003843.1 |
| NUZO | Nitrosotenuis uzonensis | N4 | GCF_000723185.1 |
| NVIE | N. viennensis | EN76 | CP007536.1 |
| SU86 | Nitrosotenuis cloacae | SAT1 | CP011097.2 |
| xob-BRI | Nitrosospira briensis | C-128 | NZ_CP012371.1 |
| xob-DEF | Nitrospira defluvii | ?? | NC_014355.1 |
| xob-EUR | Nitrosomonas europaea | ATCC19718 | NC_004757 |
| xob-EUT | Nitrosomonas eutropha | C91 | NC_008344.1 |
| xob-HAM | Nitrobacter hamburgensis | X14 | NC_007964.1 |
| xob-INO | Nitrospira inopinata | ENR4 | NZ_LN885086.1 |
| xob-MOS | Nitrospira moscoviensis | NSP M-1 | NZ_CP011801.1 |
| xob-MUL | Nitrosospira multiformis | ATCC 25196 | NC_007614.1 |
| xob-OCE | Nitrosococcus oceanii | ?? | NC_007484.1 |
| xob-WIN | Nitrobacter winograskyi | ?? | NC_007406.1 |
| xob-WIN | Sulfolobus solfataricus | P2 | AE006641 |
| xob-WIN | Pyrobaculum aerophilum | IM2 | AE009441 |
| xob-WIN | Hyperthermus butylicus | DSM 5456 | CP000493 |
| xob-WIN | Thermofilum pendens | Hrk5 | CP000505 |
| xob-WIN | Acidilobus saccharovorans | 345–15 | CP001742 |
| xob-WIN | Desulfurococcus fermentans | DSM 16532 | CP003321 |
| xob-WIN | Caldisphaera lagunensis | DSM 15908 | CP003378 |
| xob-WIN | Fervidicoccus fontis | Kam940 | CP003423 |