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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 Mexican millipeds
Bull. Univ. Utah, biol. ser., 8 (3): 1-103, pls. 1-16, f. 1-172
A new milliped of the genus Toltecolus from the United States (Anocheta: Atopetholidae)
Chicago Acad. Sci. Nat. Hist. Misc., 46: 1-3, f. 1
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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.