Genitalic segments of an alcohol-preserved female specimen of Petrobiellus akkesiensis, with a spermatophore attached to her ovipositor. A Venter of the abdominal segments VIII and IX, dorsal view, anterior at the top. B–E SEM micrographs of the same specimen shown in A, dorsal view, non-coated. B The spermatophore is attached to the basal part of the ovipositor. C Enlargement of the spermatophore. D Enlargement of the area boxed in C. E Enlargement of the boxed area in D, showing numerous sperms. — Abbreviations: Cx8, 9 – coxites VIII and IX; Gp8, 9 – gonapophyses VIII and IX; Ov – ovipositor; S – sperm; Sp – spermatophore. — Scale bars: A, B – 1 mm; C – 200 µm; D – 50 µm; E – 10 µm.

 
 
  Part of: Mtow S, Machida R (2025) Mating behavior of the jumping bristletail Petrobiellus akkesiensis (Archaeognatha: Machilidae: Petrobiellinae): Direct spermatophore transfer via genital coupling. Arthropod Systematics & Phylogeny 83: 737-756. https://doi.org/10.3897/asp.83.e159694