Fig. 2

Histological sections of genitalia with details of certain structures. s1–s8 planes of sections from Fig. 1. s1 Parasagittal section through posterior ends of copulating pair (80 min after the onset of copulation). The anal cone of the male is approaching the median lobe of the anal papillae of the female, the socius is also in contact with the lobe and with the posterior margin of the sterigma. s2 Nearly transverse (inclined to the frontal plane) section. s3 Parasagittal section through ventral lobe of anal papilla. Thin folded cuticular membrane and numerous sockets of setae (probably sensilla trichodea) are visible. s4 Parasagittal section through the distal part of valva in the area of brachiola of the male, and segment 7 of the female. Two sensilla trichodea are located at the distal part of brachiola, the sensory cell of the left sensillum is visible. s5 Parasagittal section of posterior ductus bursae during copulation (20 min after the onset of copulation). s6 Transversal section of longitudinal part of ductus bursae in the anterior area with thick endocuticle and exocuticle. Note the absence of muscles. Ejaculated material occupies the lumen (50 min after the onset of copulation). s7 Transversal section of transitional area between longitudinal and transversal part of ductus bursae with ductus seminalis insertion of a virgin female. Note the presence of a muscular sheath. s8 Parasagittal section of copulating pair 20 min after the onset of copulation. Ductus seminalis and transverse ductus bursae are cross-sectioned. Arrow (s3, s4) sensillum trichodeum, asterisk (s5–s7) thickened endocuticle. Scales: s1, s2, s4, s5, s7, s8 200 μm; s3, s6 100 μm