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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
On some diplopods of the family Fontariidae
Bull. Univ. Utah, biol. ser., 5 (3): 1-19, pls. 1-4, f. 1-37
A new genus and four new species in the diplopod family Xystodesmidae
Proc. Biol. Soc. Washington, 62: 3-6, f. 1-6
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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.