original descriptionChamberlin, R. V. (1951). Eleven new western millipeds. <em>Natural History Miscellanea.</em> 87: 1-12. page(s): 8 [details]
original description(ofOpiona hatchi Causey, 1954)Causey, N. B. (1954). The millipeds collected in the Pacific Northwest by Dr. M. H. Hatch. Annals of the Entomological Society of America, 47(1): 81-86 page(s): 82 [details]
additional sourceGardner, M. R.; Shelley, R. M. (1989). New records, species and genera of Caseyid Millipeds from the Pacific Coast of North America (Diplopoda: Chordeumatida: Caseyidae). Pan-Pacific Entomologist, 65(2): 177-268. SanFrancisco page(s): 215 [details]
additional sourceHoffman, R. L. (1999). Checklist of the millipedes of North and Middle America. <em>Virginia Museum of Natural History, special publication.</em> 8: 1-584. page(s): 262 [details]
source of synonymyJeekel, C. A. W. (1971). Nomenclator generum et familiarum Diplopodorum: A list of the genus and family-group names in the Class Diplopoda from the 10th edition of Linnaeus, 1758, to the end of 1957. Monografieen van de Nederlandse Entomologische Vereniging, 5: 1-412. Amsterdam, available online athttps://nev.nl/wp-content/uploads/2020/11/Mono-05-Jeekel-1970-OCR.pdf page(s): 73 [details]
Present Inaccurate Introduced: alien Containing type locality