Shear, William Albert. (2011). Cave millipeds of the United States. XI. Opiona graeningi, n. sp., a troglomorphic caseyid milliped from Siskiyou County, California, with comments on the genus Opiona Chamberlin 1951 (Diplopoda, Chordeumatida, Caseyidae). Zootaxa, 3114: 50-56 page(s): 52-55, Figs 1-10 [details]
original descriptionShear, William Albert. (2011). Cave millipeds of the United States. XI. Opiona graeningi, n. sp., a troglomorphic caseyid milliped from Siskiyou County, California, with comments on the genus Opiona Chamberlin 1951 (Diplopoda, Chordeumatida, Caseyidae). Zootaxa, 3114: 50-56 page(s): 52-55, Figs 1-10 [details]
Present Inaccurate Introduced: alien Containing type locality