Figures 3-11 from: Vagalinski B, Meng K, Bachvarova D, Stoev P (2018) A redescription of the poorly known cave millipede Skleroprotopus membranipedalis Zhang, 1985 (Diplopoda, Julida, Mongoliulidae), with an overview of the genus Skleroprotopus Attems, 1901. Subterranean Biology 26: 55-66. https://doi.org/10.3897/subtbiol.26.26225

Figures 3-11 Skleroprotopus membranipedalis, external morphology: 3 male antenna 4 female head, ventral view 5 male gnathochilarium, ventral view 6 left male leg 1, latero-dorsal view 7 male leg-pair 2 with penis, caudal view 8 penis in situ, lateral view 9 left male leg 3, caudal view 10 male leg-pair 7, caudal view 11 telopodite of male leg 7, caudal view. Symbols: pn: penis, ta: tarsal remnant with apical claw, te: telopodite.