Description of the genomic DNAs used in this study.

aLetters A to H correspond to the Symbiodinium clades. Species names of outgroup samples are indicated: Gymnodinium simplex, Pelagodinium beii, and Polarella glacialis.bAlpha-numeric names correspond to Symbiodinium ITS-2 rDNA molecular taxonomy sensu [71]. Letters correspond to the Symbiodinium clades, and numbers correspond to a specific ITS-2 sequence. All samples are genetically distinct, except for Symbiodinium A2, which was found in two distinct cultures and referred here to as A2_1 and A2_2. Sample D1.2 corresponds to the PSP1-05 sample originally isolated from the sponge Haliclona koremella (see [71] for details).cCulture names of DNAs extracted from Symbiodinium cultures. N/A = Not Available.*Indicates new sequences.