Loomis, H. F. (1960). Millipeds of the order Polydesmida from the western states and Baja California. Journal of the Kansas Entomological Society, 33: 57-68[details]
Sierwald, P.; Decker, P.; Spelda, J. (2024). MilliBase. Harpogonopus Loomis, 1960. Accessed at: https://www.millibase.org/aphia.php?p=taxdetails&id=1023736 on 2024-12-23
original descriptionLoomis, H. F. (1960). Millipeds of the order Polydesmida from the western states and Baja California. Journal of the Kansas Entomological Society, 33: 57-68[details]
original description(ofHarpagonopus Loomis, 1960)Loomis, H. F. (1960). Millipeds of the order Polydesmida from the western states and Baja California. Journal of the Kansas Entomological Society, 33: 57-68 page(s): 58 [details]
additional sourceShear, W. A.; Shelley, R. M. (2007). The milliped genus Tidesmus Chamberlin, 1943 (Polydesmida: Macrosternodesmidae). Zootaxa, 1656: 51-68[details]
additional sourceShear, William Albert; Reddell, James M. (2017). Cave millipedes of the United States. XIV. Revalidation of the genus Speorthus Chamberlin, 1952 (Diplopoda, Polydesmida, Macrosternodesmidae), with a description of a new species from Texas and remarks on the families Polydesmidae and Macrosternodesmidae in North America. Insecta Mundi, 0529: 1-13[details]