SEM micrographs of genitalic segments in Petrobiellus akkesiensis male, anterior to the top. A Venter of the abdominal segments VIII and IX, ventral view. B Venter of the abdominal segment IX, dorsal view. C Enlargement of the stylus IX, dorsal view. D Enlargement of a strong spine on the dorsomesally-concaved side of the stylus IX. E Penis and parameres IX, lateral view, dorsal to the right. F Enlargement of the distal article of the penis, lateral view. G Enlargement of a short seta on the dorsal side of the distal article of the penis. H Setation on the distal part of the paramere IX, lateral view. — Abbreviations: Cx8, 9 – coxites VIII and IX; Pa9 – paramere IX; Pe – penis; St8, 9 – styli VIII and IX. — Symbols: asterisk – dorsomesally-concaved side of stylus IX; star – genital opening. — Scale bars: A – 1 mm; B – 500 µm; C, E – 200 µm; F – 50 µm; D, H – 10 µm; G – 2 µm.