Abstract
The new species Opiona graeningi is described from caves in the Marble Mountain Wilderness Area, Klamath National Forest, Siskiyou Co., California, as the first troglomorphic species of Opiona, the first troglobiont from the globally important Klamath Siskiyou ecoregion, and possibly the first troglobiotic caseyid. Notes are provided on the composition of the genus Opiona and on the interpretation of the gonopods. Opiona, with 13 described species, may not be monophyletic.References
Causey, N.B. (1963) Two new caseyid millipeds from California caves (Choredumida: Chordeumidea). The Wasmann Journal of Biology, 21, 193–198.
Chamberlin, R.V. (1951) Eleven new western millipedes. Chicago Academy of Sciences, Natural History Miscellanea, 87, 1–12.
Gardner, M.R. & Shelley, R.M. (1989) New records, species, and genera of caseyid millipeds from the Pacific Coast of North America (Diplopoda: Choreumatida: Caseyidae). Pan-Pacific Entomologist, 65, 177–268.
Knutson, S., Ream, C. & Sundquist, R. (1999) The Marble Valley Project. National Speleological Society News, 57, 200–213.
Olson, D.M., & Dinerstein, E. (1998) The Global 200: A representation approach to conserving the Earth's most biologically valuable ecoregions. Conservation Biology, 12, 502–515.
Shear, W.A. (1971) The milliped family Conotylidae in North America, with a description of the new family Adritylidae (Diplopoda:Chordeumida). Bulletin of the Museum of Comparative Zoology, 141, 55–97.
Shear, W.A. (1972) Studies in the milliped order Chordeumida (Diplopoda): a revision of the family Cleidogonidae and a reclassification of the order Chordeumida in the New World. Bulletin of the Museum of Comparative Zoology, 144, 151–352.
Shear, W.A. (1976) The milliped family Conotylidae (Diplopoda, Chordeumida): revision of the genus Taiyutyla, with notes on recently proposed taxa. American Museum Novitates, 2600, 1–22.
Shear, W.A. (2004) Two new species in the milliped genus Taiyutyla from British Columbia, Canada, and Washington, USA (Diplopoda, Chordeumatida, Conotylidae). Myriapodologica, 8, 13–20.
Shear, W.A. & Leonard, W.P. (2007) Additions to the milliped family Caseyidae, I. Caseya richarti, n. sp., and new records of previously described species in the genus Caseya Cook and Collins 1895 (Diplopoda, Chordeumatida, Caseyidae). Zootaxa, 1524, 23–34.
Shelley, R.M., Shear, W.A., Leonard, W.P., Ovaska, K. (2007) Diplopoda, Chordeumatida, Caseyidae, Opiona columbiana Chamberlin, 1951: Distribution extensions into the Alexander Archipelago, Alaska, USA, Queen Charlotte Islands, British Columbia, Canada, and eastern & southern Washington State, USA; additional new records from British Columbia and Washington. Check List, 3, 14–17.
Stein, B.A., L.S. Kutner, and J.S. Adams, editors. (2000) Precious heritage: the status of biodiversity in the United States. The Nature Conservancy and Association for Biodiversity Information. Oxford University Press, New York, New York, 399 pp.