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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
Notes on some centipeds and millipeds from Utah
Pan-Pacific Ent. 2 (2)
Crested millipeds of the family Lysiopetalidae in North America, with descriptions of new genera and species
Proc. U.S. Nat. Mus., 84 (3006): 97-135, f. 16-18, pls. 3-4
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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.