Nolasco Samuel, G. and Valdez-Mondragón, A. 2022. Four new species of the spider genus Physocyclus Simon, 1893 (Araneae: Pholcidae) from Mexico, with updated taxonomic identification keys. European Journal of Taxonomy. 813, 1 (Apr. 2022), 173-206. DOI:https://doi.org/10.5852/ejt.2022.813.1739.