Narceus

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Subphylum: Myriapoda
Classis: Diplopoda
Subclassis: Chilognatha
Infraclassis: Helminthomorpha
Superordo: Anocheta
Ordo: Spirobolida

Familia: Spirobolidae
Genus: Narceus
Species: N. americanus – N. annularis – N. atratus – N. dolleyi – N. gordanus – N. keysi – N. melanior – N. oklahomae – N. orophilus – N. pensacolae – N. ramstadti – N. scotti – N. tinctorius – N. woodi
Name

Narceus Rafinesque, 1820
Synonyms

Arctobolus Cook, 1904
Rhexenor Rafinesque, 1820: 8
Spirobolus Wood, 1865

References

Rafinesque, C. S. 1820. VI Class. Entomia. - The Insects. Annals of Nature, 1:8. https://www.biodiversitylibrary.org/item/54185#page/25/mode/1up

Narceus is a genus of large cylindrical millipedes of the family Spirobolidae native to eastern North America. The genus comprises three or four species, two of which are endemic to Florida, and the remainder forming a species complex. The species of Narceus include some of the largest and most recognizable millipedes in eastern North America.
Description

Narceus individuals range from 4 to 12 cm (1.6 to 4.7 in) long, with 45 to 59 segments as adults. Their body color is various shades of brown with reddish to yellow stripes on each segment.[3]
Species

Narceus americanus / Narceus annularis complex - New England to Minnesota, south to Texas and Florida. Extends into southern Quebec and Ontario in Canada.
Narceus gordanus - Florida to South Carolina, possibly Tennessee[3]
Narceus woodruffi - Florida

The species N. americanus and N. annularis are widely distributed in North America, and may represent an intergradation of forms rather than two distinct species, a group known as the "N. americanus/annularis complex".[4]
References

Rafinesque, C. S. (1820). "VI Class. Entomia. - The Insects". Annals of Nature. 1: 8. Retrieved from Biodiversity Heritage Library.
For the origin of this name, see Rhexenor.
Keeton, William T. (1960). "A taxonomic study of the milliped family Spirobolidae (Diplopoda; Spirobolida)". Memoirs of the American Entomological Society. 17: 1–146.
Shelley, Rowland M.; McAllister, Chris T.; Medrano, Michael F. (2006). "Distribution of the Milliped Genus Narceus Rafinesque, 1820 (Spirobolida: Spirobolidae): Occurrences in New England and West of the Mississippi River; a Summary of Peripheral Localities; and First Records From Connecticut, Delaware, Maine, and Minnesota". Western North American Naturalist. 66 (3): 374–389. doi:10.3398/1527-0904(2006)66[374:DOTMGN]2.0.CO;2.