Fig. 5

Schematic reconstruction of the nervous system of the copulatory organ as revealed by FMRFamide-like (a-c), FVRIamide-like (d-f), and MIP-like immunoreactivity (g, h, i) of male Dinophilidae, based on CLSM z-stacks. Morphology of the males of Trilobodrilus axi (a, d, g), Dinophilus vorticoides (b, e, h) including orange pigmentation) and D. gyrociliatus (c, f, i) in ventral (large drawing), and lateral view (small inset). Larger drawings show only the ventral half of the animal (all dorsal nerves are omitted, except in D. gyrociliatus, whose reproductive system extends further dorsally). Thin black lines in tip of penis cone in D. vorticoides and D. gyrociliatus represent rod-like secretes of stylet glands. Abbreviations: com6 – sixth body commissure, cpfm – circumpenial fibre mass, dpc – dorsal penial commissure, mvn – medioventral nerve, nsv – nerves of the seminal vesicles, n15 – neuron 15 (nomenclature based on Windoffer & Westheide 1988a, b), pcm – penis cone muscle, pg – penial ganglion, pmn – paramedian nerve, pn – peripheral nerve, tcom – terminal commissure, vg – ventral ganglion, vlnc – ventrolateral nerve cord, vpc – ventral penial commissure