Fig. 2
From: Molecular evolution and expression of opsin genes in Hydra vulgaris
Cnidarian opsin phylogeny. Opsin phylogenetic tree generated using amino acid sequences for Hydra vulgaris, Podocoryna carnea, Cladonema radiatum, Tripedelia cystophora, Nematostella vectensis, Mnemiopsis leidyi, Trichoplax adhaerens, Drosophila melanogaster and Homo sapiens. Maximum-likelihood tree was generated using a LG + G + F model and 100 boostrap support