Vagalinski, B., Borissov, S., Bobeva, A., Canciani, G. and 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, 1 (Feb. 2022), 30-69. DOI:https://doi.org/10.5852/ejt.2022.798.1669.