Figure 6

Distribution of serotonin-immunoreactive neurons mapped on the current phylogeny of Remipedia. 50% majority-rule consensus tree of Remipedia based on a Bayesian analysis of cytochrome oxidase c subunit 1 sequence data (adapted from [66]). The three species that were investigated in this study are written in black. The schematic drawings represent the distribution of 5HT-ir neurons in one hemiganglia of the corresponding species. The loss of the anterior 5HT-ir neuron (ASC) might be an apomorphy of the clade of the genus Cryptocorynetes plus Speleonectes benjamini (indicated by red arrowhead).