Figure 1. Phylogenetic tree of Symbiodinium extracted from various gorgonian host species based on ITS2 sequences from modern and museum-held specimens collected from Florida (FL), Cuba (CU), and the Bahamas (BH).

Year of collection is noted in each branch label. These groups are shown in comparison to reference sequences from GeoSymbio from common clade B sub-types as well as a clade A3 sequence as an outgroup. Tree construction was based on neighbor-joining. Branch labels indicate the number of unique substitutions per sequence and branches are scaled to average substitutions per site, with the exception of A3 which was cropped.