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Order Polydesmida - Flat-backed Millipedes

Millipede - Oxidus gracilis Flat Millipede: possible cherokia georgiana? - Cherokia georgiana Another Santa Cruz Millipede - Harpaphe haydeniana Apheloria species? millipede - Semionellus placidus ID please - Oxidus gracilis long and quite thin - Oxidus gracilis Caterpillar - Harpaphe haydeniana
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Myriapoda (Myriapods)
Class Diplopoda (Millipedes)
Order Polydesmida (Flat-backed Millipedes)
Numbers
About 28 families worldwide.
10 families in North America.
Size
3-130mm
Identification
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.
Remarks
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.