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Genus Tylobolus

Narceus sp? - Tylobolus Millipede (Tylobolus uncigeris?) - Tylobolus uncigerus Long dark millipede - Tylobolus uncigerus Spirobolida? - Tylobolus Millipede - which? - Tylobolus Tylobolus? - Tylobolus uncigerus Shiny Black Millipede from Oregon - Tylobolus uncigerus Tylobolus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Myriapoda (Myriapods)
Class Diplopoda (Millipedes)
Order Spirobolida
Family Spirobolidae
Genus Tylobolus
Synonyms and other taxonomic changes
Tylobolus Cook, 1904
Auxobolus Chamberlin, 1949
CalifornibolusVerhoeff, 1944
7 species
to 92 mm long, 10 mm wide
Relatively large cylindrical millipedes with 42-54 body rings. Eyes are widely spaced, with more than twice the width of an eye between them. Base color ranges from dark blackish to dull reddish brown, with some species having bright red and yellow bands on the posterior margin of each ring. Male gonopods are normally concealed within a pouch.
North America west of the Rocky Mountains, all but one species west of Pacific Crest.
See Also
Range overlaps with Hiltonius from Kern County, CA to Baja. Tylobolus differs from Hiltonius by having more ocelli per eye (27-50), a larger and hooked process on the coxa of the third legs in males, and sharper corners of the mandibular stipes.

May be mistaken in photos for Narceus, a species complex widespread in eastern North America, but the two genera do not overlap.
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.
Keeton, W. (1966). The species of the milliped genus Tylobolus (Diplopoda: Spirobolida). A re-examination. Transactions of the American Entomological Society , 92(1), 17–28.