Shikokuobius altaicus sp. n., male paratype (1, 3, 6) and female paratype (2, 4, 5). 1 forcipulae, ventral view 2 head, ventral view 3 12–14 sternites and coxae, ventral view 4 dental margin of forcipular coxosternite 5 13–16 tergites, dorsal view 6 mandibula, ventrolateral view. Abbreviations: TO Tömösváry’s organ, CO coxal pore. Scale bars: 0.1 mm (1–5), 0.05 mm (6).