Figure 3.

Maximum likelihood phylogenetic tree of Hexacorallia mitogenomes. The tree was constructed based on the concatenated proteins of the 13 PCGs from 530 coral species by iq-tree (v1.6.12) software [53], among which Octocorallia mitogenomes were used as the outgroup. Five deep-sea corals were marked with yellow stars in this study. The colors in the phylogenetic tree represent 49 families within Hexacorallia. The concentric cycles from inter to outer were the orders, genome sizes, and GC contents. The average genome size (18,732 bp) and GC content (38.60%) were used as baseline values in each cycle. The mitogenomes were listed in Supplementary Table S1.