Sigmoria nigrimontis is a species of flat-backed millipede in the family Xystodesmidae.

[1][2][3][4] It is found in North America.

[1][5] These four subspecies belong to the species Sigmoria nigrimontis: Data sources: i = ITIS,[1] c = Catalogue of Life,[2] g = GBIF,[3] b = Bugguide.net[4]

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