Maximum-likelihood phylogeny of crustacean opsins, including the 33 opsins characterized from N. oerstedii eyes. N. oerstedii opsins are in bold, and divided into subgroups based on spectral clade (LWS, subgroups A to E; MWS, subgroups G to I; SWS/UVS, subgroups J to K). Clades of opsins from related taxonomic groups have been collapsed for clarity. For stomatopod opsins, clades of opsins from a single species have been collapsed, and the number of opsins indicated in parentheses behind the species name. Maximum-likelihood bootstrap support and Bayesian posterior probabilities are mapped to the visible branches.