Causey, N. B. (1974). The phylogeny of the family Paraiulidae Paraiuloidea. Symposia of the Zoological Society of London, 32: 23-39. London page(s): 32 [details]
Sierwald, P.; Decker, P.; Spelda, J. (2025). MilliBase. Ptyoiulinae Causey, 1974. Accessed at: https://www.millibase.org/aphia.php?p=taxdetails&id=888957 on 2025-05-04
original descriptionCausey, N. B. (1974). The phylogeny of the family Paraiulidae Paraiuloidea. Symposia of the Zoological Society of London, 32: 23-39. London page(s): 32 [details]
original description(ofPtyoiulini Causey, 1974)Causey, N. B. (1974). The phylogeny of the family Paraiulidae Paraiuloidea. Symposia of the Zoological Society of London, 32: 23-39. London page(s): 33 [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