Evolutionary relationships of Kuafuorterviruses and known LTR-like retroelements. (a), (c), (e), (g), and (i) are for the small dataset, whereas (b), (d), (f), (h), and (j) are for the large dataset. (a and b) Phylogenetic trees of Kuafuorterviruses, known LTR-like retroelements, and non-LTR retrotransposons. The phylogenetic trees were inferred based on RT proteins using a maximum likelihood method with non-LTR retrotransposons as outgroups. UFBoot support values are shown near the selected nodes. (c and d) Phylogenetic networks of Kuafuorterviruses, known LTR-like retroelements, and non-LTR retrotransposons. The phylogenetic networks were reconstructed based on RT proteins using SplitsTree 4. Each set of parallel lines represents a split, in which the length is proportional to the weight of this split. Major splits are colored in different colors. (e and f) Visualization of SSNs using the Fruchterman–Reingold layout algorithm. Each node represents the RT protein of a retroelement, and each edge indicates protein-to-protein interaction weighted by 1/distance. The nodes are colored following the groups which they belong to. (g and h) SSNs with nodes colored based on the modularity class. (i and j) SSNs with nodes colored based on the CC.