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Family Paradoxosomatidae

Millipede - Oxidus gracilis Millipede - Oxidus gracilis Millipede - Oxidus gracilis Flat backed millipedes - Oxidus gracilis Oxidus gracilis Oxidus sp.? - Oxidus gracilis Small Millipedes - Oxidus gracilis Baltimore Millipede - Oxidus gracilis
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Myriapoda (Myriapods)
Class Diplopoda (Millipedes)
Order Polydesmida (Flat-backed Millipedes)
Family Paradoxosomatidae
Numbers
>700 spp. worldwide
Five introduced species in North America.
Identification
"For practical purposes, the family Paradoxosomatidae can be recognized by the dorsal transverse grooves on the 'metazona' of each segment." -- Rowland Shelley

Range
Not native to North America; introduced species Oxidus gracilis is widespread.
Remarks
Known species in US and Canada: (1)(2)

Akamptogonus novarae - California
Asiomorpha coarctata - Gulf Coast states.
Oxidus gracilis - Widespread, probably all states and provinces

See here for comparison of A. coarctata and O. gracilis.
Internet References
Rowland Shelley: Photos of Paradoxosomatidae. The Myriapoda (Millipedes, Centipedes) Featuring the North American Fauna.
Works Cited
1.Checklist of the millipeds of North and Middle America
Richard L. Hoffman. 1999. Virginia Museum of Natural History Special Publications.
2.Annotated checklist of the millipeds of Florida (Arthropoda: Diplopoda)
Rowland M. Shelley. 2000. Insecta Mundi, 14(4), 241–251.