Fig. 2: Phylogenomics of the viral operational taxonomic units (vOTUs) from the class Caudoviricetes in the built environments (BEs).

a A maximum-likelihood phylogenetic tree of 87 species-level vOTUs derived from BEs. The branches of the two clusters of Oshimavirus and Bendigovirus are shown in light green and orange, respectively. The gray and white circles denote the novel Caudoviricetes viruses. b A maximum-likelihood phylogenetic tree of 599 species-level vOTUs derived from BEs and other datasets (SMGC, GOV, and MetaSUB). Branches of the novel Caudoviricetes vOTUs are shown in red. Lineages with branch lengths <0.5 kb were collapsed into a clade and are shown in white on the outer ring.