additional sourceDemange, J.-M. (1957). Un nouveau myriapode de Guinée Française Gymnostreptus madegama n. sp. - Diplopode - Spirostreptidae). Bulletin du Muséum national d'Histoire Naturelle, 2e Série, 29: 414-417. Paris page(s): 417; note: Gymnostreptus pyrhocephalus [details]
redescriptionAttems, C. M. T. Graf von (1928). The Myriopoda of South Africa. Annals of the South African Museum, 26: 1-431. Edinburgh, available online athttps://biodiversitylibrary.org/page/40649179 page(s): 353-354, pl. 12, fig. 307, pl. 13, fig. 308; note: Gymnostreptus (Orthoporus) pyrrhocephalus. [details]