Fig. 12

Evolution of the serotonin-LI-reactive nervous system in Chaetonotida. Schematic presentation of dorsal view, anterior end on top, posterior end on bottom. Turbanella ambronensis adapted from [71], Neodasys chaetonotoideus adapted from [12], and Xenotrichula intermedia and X. velox adapted from [13]. If CLSM pictures are available for representatives of the Group B [77], no formal descriptions exist for this group. The phylogeny follows the results of the present study (Fig. 1). See the discussion for further considerations on the different homologies, and variation between the different immunostainings