Drawing showing sperm transfer in Petrobiellus akkesiensis, reconstructed based on Fig. 4D. The ovipositor is held at the three points (arrows) by the male, with the penis and the styli IX of both sides. See the text for details. Numerals indicate the abdominal segment number to which each structure belongs. — Abbreviations: Ce – cercus; CF – caudal filament; S6–8 – sternites VI to VIII; T7–10 – terga VII to X.