Cook, O. F.; Collins, G. N. (1895). The Craspedosomatidae of North America. Annals of the New York Academy of Sciences, 9: 1-100. New York, available online athttp://biodiversitylibrary.org/page/35260543 page(s): 6 [details]
Sierwald, P.; Decker, P.; Spelda, J. (2024). MilliBase. Ptyoiulus Cook, 1895. Accessed at: https://www.millibase.org/aphia.php?p=taxdetails&id=892453 on 2024-12-14
original descriptionCook, O. F.; Collins, G. N. (1895). The Craspedosomatidae of North America. Annals of the New York Academy of Sciences, 9: 1-100. New York, available online athttp://biodiversitylibrary.org/page/35260543 page(s): 6 [details]
additional sourceShelley, R. M.; Smith, J. M. (2016). Parajulid milliped studies XII: Initial assessment of <em>Ptyoiulus</em> Cook 1895 and neotype designations for <em>Julus impressus</em> Say 1821 and <em>J. montanus</em> Cope 1869 (Diplopoda: Julida). <em>Insecta Mundi.</em> (0522): 1-21., available online athttps://digitalcommons.unl.edu/insectamundi/1027/[details] Available for editors