Fig. 1.

Summary of neomeniomorph neurogenesis and adult neuroanatomy. a Schematic representation of neomeniomorph neurogenesis from the freshly hatched test cell larva until the juvenile stage. Anterior faces up. Neural structures are drawn in yellow. Reconstruction based on Redl et al. (2014). b Confocal scan (maximum intensity projection, color depth coding) of the adult CNS, anterior region. Anterior to the right. Anti-serotonin (5-HT) staining. c Same confocal scan (maximum intensity projection) as in (b), but with additional nucleic acid staining (DAPI) to reveal nuclei of the cerebral ganglia. d Schematic representation of the posterior and anterior major elements of the adult nervous system of Wirenia argentea based on (b) and (c) as well as Todt et al. (2008). Abbreviations: vestibular (atrial) sense organ (vso); basal ganglion (bg); buccal commissure (buc); buccal ganglion (bug); cerebral ganglion (cg); dorsoterminal sense organ (dts); frontal ganglia (fg); innervation of vestibular (atrial) sense organ (iv); innervation of pedal pit (ip); lateral ganglion (lg); lateroventral commissure (lvc); mouth (m); pedal ganglion (pg); pedal pit (pp); posterior ganglion (pog); ventral commissure (vc); ventral neural plexus (vnp); nerves of pedal pit (arrowhead); lateral (visceral) nerve cord (arrow); ventral (pedal) nerve cord (double arrowhead); mouth opening (asterisk). Scale bars: 100 μm