Skleroprotopus membranipedalis, gonopods and vulva: 12 left anterior gonopods, caudal, slightly lateral view 13 left anterior gonopod, lateral view 14 left posterior gonopod, lateral view 15 right posterior gonopod, antero-mesal view 16 same, mesal view 17 left vulva, lateral view. Symbols: a: anterior process, b: axe blade-like process, f: flagellum, op: operculum, p: posterior process, r: remnant of a podomere; rs: receptaculum seminis, , sp: basal spine, te: telopodite. Scale bar (17): 0.2 mm.

 
 
  Part of: 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