Polydesmidae, Leach, 1815

Shear, William A. & Reddell, James M., 2017, Cave millipedes of the United States. XIV. Revalidation of the genus Speorthus Chamberlin, 1952 (Diplopoda, Polydesmida, Macrosternodesmidae), with a description of a new species from Texas and remarks on the families Polydesmidae and Macrosternodesmidae in North America, Insecta Mundi 2017 (529), pp. 1-13 : 6

Genera of Polydesmidae in North America North of Mexico (Keyed in Shear 2012)

Polydesmus Latrielle (4 species, all colonists from Europe), Brachydesmus Heller (1 species, native to Europe), Bidentogon Buckett and Gardner (2 species, California), Calianotus Shelley (3 species, California), Pseudopolydesmus (12 nominal species, eastern United States and southeastern Canada), Scytonotus (9 species, eastern United States, southeastern Canada, Pacific Coast from Alaska to northern California, northern Rocky Mountains), Utadesmus (2 species, Utah, New Mexico), Snoqualmia (2 species, Washington, Idaho) and Retrorsia (2 species, western Oregon and Washington). There are several undescribed genera ranging from Washington to northern California.