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Order Spirobolida

Red and black millipedes (Narceus americanus) - Narceus americanus-annularis-complex Tylobolus? - Hiltonius pulchrus American or Worm Millipede - Narceus americanus-annularis-complex Millipede - Narceus americanus-annularis-complex Millipede - Narceus americanus-annularis-complex Millipede - Narceus americanus-annularis-complex Tylobolus? - Tylobolus uncigerus Tylobolus? - Tylobolus uncigerus
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Myriapoda (Myriapods)
Class Diplopoda (Millipedes)
Order Spirobolida
Numbers
12 families worldwide
6 families in North America (2 introduced).
About 35 species occur north of Mexico. (1)
Size
Up to 200mm (tropical species)
Identification
Cylindrical body. Eyes usually present. Dorsal groove absent. Paranota absent. >30 segments. Have only one pair of legs on the fifth ring; other millipedes have two pairs. The male's sex organs (gonopods) are hidden in a pouch. (1)
Vertical suture on lower front of head extending upwards from labrum (see below) distinguishes Spirobolida from Julida and Spirostrepsida.
See also this photo.
Works Cited
1.Spiders and Their Kin: A Golden Guide from St. Martin's Press
Herbert W. Levi, Lorna R. Levi, Nicholas Strekalovsky. 2001. St. Martin's Press.