Confocal micrographs of the postmetamorphic, FMRFamidergic neurogenesis in Aeolidiella stephanieae. Anterior faces upwards and scale bars represent 50 μm in all aspects. All aspects are in lateral view. (A) Early juvenile specimen slightly after metamorphosis showing the cerebropleural (cpg) and pedal ganglia (pg). Note the nerve from the pedal ganglion that is running to the cell cluster in the visceral body part (inset, arrow); pp marks the propodium, mp the metapodium, and e the eye. (B) Early juvenile with the anlage of the rhinophore (r), jaw (jw) and cerebropleural ganglia, which are connected to the pedal ganglia and the pleurovisceral loop (plvis). Note the FMRFamidergic cells along the entire lengths of the foot. (C) Slightly older early juvenile than in B showing the rhinophoral ganglion (double arrowhead) from which a nerve (n3) is running towards the rhinophore. Note the buccal ganglion (bg) posteroventrally to the jaw, and the optical ganglia laterally to the respective eye (og). (D) Juvenile specimen with the anlage of cerata (c) showing the condensed central nervous system where the connective between the cerebropleural ganglion and the pedal ganglion is short. (E) Late juvenile with cnidosacs (cn) on the tips of the cerata and oral tentacles (ot). Note the condensation of FMRFamide positive cells in the anterior part of the foot (double-headed arrow).