Table 1.

Predicted bacterial and archaeal host phyla with corresponding number of UViGs. Archaeal phyla are indicated with (A)

Host phylum	Viral contig count
Euryarchaeota (A)	218
Crenarchaeota (A)	58
ca. Micrarchaeota (A)	40
Thaumarchaeota (A)	6
ca. Bathyarchaeota (A)	4
Aigarchaeota (A)	4
Nanoarchaeota (A)	2
Thermotogae (A)	1
Firmicutes	8123
Proteobacteria	5911
Bacteroidetes	3583
Actinobacteria	1971
Fusobacteria	1801
Spirochaetes	130
Verrucomicrobia	127
Synergistetes	58
Thermotogae	53
Chloroflexi	52
Cyanobacteria	47
Chlorobi	47
Deinococcus-Thermus	32
Aquificae	26
Fibrobacteres	21
Planctomycetes	15
Chlamydiae	14
Ignavibacteriae	12
Caldiserica	9
ca. Atribacteria	9
Gemmatimonadetes	8
ca. Desantisbacteria	7
Armatimonadetes	5
ca. Marinimicrobia	5
ca. Fervidibacteria	4
ca. Cloacimonetes	4
ca. Microgenomates	3
Marinimicrobia	3
ca. Moranbacteria	3
ca. Parcubacteria	3
ca. Aminicenantes	2
ca. Saccharibacteria	2
Nitrospirae	2
Tenericutes	2
ca. Wildermuthbacteria	2
ca. Daviesbacteria	2
ca. Omnitrophica	1
Lentisphaerae	1
Acidobacteria	1
ca. Gracilibacteria	1
Thermodesulfobacteria	1

*Host phyla without a previous connected virus. Microbial phyla classification according to the IMG/M system.

†Candidate Phyla from the CPR.