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Family Spirobolidae

Red and black millipedes (Narceus americanus) - Narceus americanus-annularis-complex millipede with eggs - Narceus americanus-annularis-complex - female Narceus americanus - Narceus americanus-annularis-complex Narceus gordanus Millipede - Narceus americanus-annularis-complex Millipede? Large centipede ? - Narceus americanus-annularis-complex Millipede #13 Paw Paw - Narceus americanus-annularis-complex
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Myriapoda (Myriapods)
Class Diplopoda (Millipedes)
Order Spirobolida
Family Spirobolidae
Two subfamilies with six genera:

Aztecolus - Mexico
Chicobolus - South Carolina to Florida
Narceus - Eastern North America from southern Ontario and Quebec south to Florida, west to Nebraska and Texas
Spirobolus - China and Taiwan

Hiltonius - Southern California south to Guatemala
Tylobolus - Oregon south to California
4-12 cm long
Includes some of the largest millipedes in North America, much longer and wider than similar-looking Julida
Print References
Keeton, William T. (1960). "A taxonomic study of the milliped family Spirobolidae (Diplopoda; Spirobolida)". Memoirs of the American Entomological Society. 17: 1–146 Available online from Biodiversity Heritage Library
Internet References