Lewis, J.G.E. 2015.

On Verhoeff’s Otostigmus subgenus Malaccopleurus, the nudus group of
Otostigmus subgenus Otostigmus Porat, 1876, and Digitipes Attems, 1930, with a description of the foetus stadium larva in O. sulcipes Verhoeff, 1937, (Chilopoda: Scolopendromorpha: Scolopendridae)

. Zootaxa. 4039, 2 (Nov. 2015), 225–248. DOI:https://doi.org/10.11646/zootaxa.4039.2.2.