FIGURES 8–10. Opiona graeningi, n in 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)

FIGURES 8–10. Opiona graeningi, n. sp., gonopods. Fig. 8, anterior view. Fig. 9, posterior view. Fig. 10, lateral view. See text for labels.