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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 genera and species of North American Pariulidae
Bull. Univ. Utah, biol. ser., 5 (7): 1-39, pls. 1-8, f. 1-73
Some records and descriptions of American diplopods
Proc. Biol. Soc. Washington, 56: 143-152, pls. 7-8, f. 1-15
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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.