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Some related literature:
[NAML]; Chamberlin & Hoffman, 1958
Checklist of the Millipeds of the North America
U.S. Nat. Mus. Bull. 212
New western millipeds
Bull. Univ. Utah, biol. ser., 6 (5): 1-23, pls. 1-3, f. 1-30
Three new genera and eight new species of western millipeds
Chicago Acad. Sci. Nat. Hist. Misc., 68: 1-6, f. 1-3
Cook & Loomis, 1928
Millipeds of the order Colobognatha, with descriptions of six new genera and type species, from Arizona and California
Proc. U.S. Nat. Mus., 72 (art. 18): 1-26, f. 1-6, pls. 1-2
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Keep in mind that the taxonomic information is copied from various sources, and may include many inaccuracies. Expert help is welcome.