Sigmoria nigrimontis is a species of flat-backed millipede in the family Xystodesmidae. It is found in North America.
Subspecies These four subspecies belong to the species Sigmoria nigrimontis: Sigmoria nigrimontis angulosa Shelley, 1981 i c g Sigmoria nigrimontis intermedia (Hoffman, 1948) i c g Sigmoria nigrimontis nigrimontis (Chamberlin, 1947) i c g Sigmoria nigrimontis unicoi Shelley, 1981 i c g Data sources: i = ITIS, c = Catalogue of Life, g = GBIF, b = Bugguide.net
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