Fig. 3

Anthozoan-specific opsin evolutionary patterns of duplication and loss. Trees are zoomed subsets of the maximum-likelihood tree (Fig. 1C) for each anthozoan opsin group. Species names and branches are color coded according to lineage. Support for branches is denoted with a black circle or a white circle. A ASO-I group opsins are split into two main subclades, with most anthozoans having an opsin duplicate in each subclade. B The ASO-II group is sister to c-opsins and comprised exclusively of opsins from hexacorals. Previously identified ASO-II Groups 2.1 and 2.2 [6] are well-supported but ASO-II Group 1 is not. C Anthozoan cnidopsins form a single well-supported clade within the larger cnidopsin/xenopsin clade. Within Anthozoan cnidopsins there are two sister clades, one of which is well-supported while the other is not. For clarity, branch lengths are transformed, and branch support is not shown for branches leading to the two shallow-most nodes on these trees (For full tree topology and support values see Fig. 1C, Additional File 2)