original description
(of Platyrrhacus calius Chamberlin, 1952) Chamberlin, R. V. (1952). Some American Polydesmid Millipeds in the collection of the Chicago Museum of Natural History. <em>Annals of the Entomological Society of America.</em> 45(4): 553-584.
page(s): 579, 581, fig. 45 [details] Available for editors 
additional source
Recuero, E.; Sánchez-Vialas, A. (2018). A new distinctive species of Barydesmus (Diplopoda, Polydesmida, Platyrhacidae) from Ecuador, with an annotated bibliographical checklist of the American Platyrhacidae. <em>Zootaxa.</em> 4482(2): 245-273., available online at https://doi.org/10.11646/zootaxa.4482.2.2
page(s): 266 [details] Available for editors 
From editor or global species database