E: Gonangulum (LC9) area and surrounding elements shown
semi-schematically, explaining design of Fig. 3AeF (compare Figs. 1A and 3D); membrane included, light grey; gonangulum dark grey, other sclerotisations midgrey; undulate lines
are cuts through cuticle. F: Gonangulum sclerotisation (LC9) and adjacent parts of surrounding sclerotisations shown schematically, explaining design of Fig. 4AeF (compare
Figs. 1A,E and 4D); gonangulum dark grey, other sclerotisations midgrey; patches in light grey are muscle attachments, ribbons in very dark grey are sulci. Orientation in all pictures:
[ anterior. Scale bar 0.5 mm, valid for Fig. 1A,B.