Vagalinski, B.; Borissov, S.; Bobeva, A.; Canciani, G.; Antić, D. Ž. (2022). The mostly cavernicolous millipede genus Stygiiulus Verhoeff, 1929, stat. nov.: taxonomy, distribution and phylogenetic relationships (Diplopoda, Julida, Julidae).
European Journal of Taxonomy. 798: 30-69.