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Fig. 10 | BMC Evolutionary Biology

Fig. 10

From: Serotonin-immunoreactivity in the ventral nerve cord of Pycnogonida – support for individually identifiable neurons as ancestral feature of the arthropod nervous system

Fig. 10

Phylogenetic position of the last common ancestor of the three investigated pycnogonid species. Simplified phylograms of the two most comprehensive phylogenetic analyses of internal pycnogonid relationships (For simplicity, Nymphon floridanum, which renders Nymphonidae polyphyletic in Arango and Wheeler (2007), has been omitted). Depending on which hypothesis is favored, the last common ancestor (green arrows) of the three investigated species is the stem species of crown-group pycnogonids (Arango and Wheeler 2007, left side) or of all extant pycnogonids to the exclusion of Austrodecidae (Arabi et al. 2010, right side). The groups highlighted in green include the three species investigated in this study

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