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For Insects, Spiders & Their Kin
For the United States & Canada
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Order Polydesmida - Flat-backed Millipedes

Polydesmida? - Polydesmus millipede - Oxidus gracilis Millipede - Pseudopolydesmus Millipede? - Harpaphe haydeniana DSC00329 - Apheloria virginiensis Possible Flat-backed Millipede - Order Polydesmida - Apheloria virginiensis millipede id? millipede sp - Oxidus gracilis
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Myriapoda (Myriapods)
Class Diplopoda (Millipedes)
Order Polydesmida (Flat-backed Millipedes)
About 28 families worldwide.
10 families in North America.
18 to 22 body rings. 20 body rings is the most common. Dorsal groove absent. Large paranota (wing-like lateral extensions of the body segment) give a flattened appearance to many species, although paranota lacking in some species. Members of some families vividly colored with red, yellow, orange and black.
The largest millipede order, and the only one that produces cyanide as a defense.(1)
See Also
Some Chordeumatida (e.g. in Rhiscosomididae, Striariidae, Tingupidae) have prominent paranota and a similar "flat-back" appearance, but possess >25 body segments.
Works Cited
1.Centipedes and Millipedes, with an Emphasis on North American Fauna
Rowland M. Shelley. 1999. Emporia State University.