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Genus Pseudopolydesmus

Millipede - Pseudopolydesmus canadensis A day of Millipedes, species B - Pseudopolydesmus Gonopodes of Pseudopolydesmus canadensis - Pseudopolydesmus canadensis - male Flat-backed Millipede - Pseudopolydesmus  Pseudopolydesmus? - Pseudopolydesmus Unknown - Pseudopolydesmus Polydesmidae - Pseudopolydesmus Polydesmidae - Pseudopolydesmus serratus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Myriapoda (Myriapods)
Class Diplopoda (Millipedes)
Order Polydesmida (Flat-backed Millipedes)
Family Polydesmidae
Genus Pseudopolydesmus
Synonyms and other taxonomic changes
Attems, 1898
Dixidesmus Chamberlin, 1943
Hoffman 1999 gives 12 species, though some of these may be synonyms:
Pseudopolydesmus caddo Chamberlin 1949
Pseudopolydesmus canadensis (Newport) 1844
Pseudopolydesmus collinus Hoffman 1974
Pseudopolydesmus erasus (Loomis) 1943
Pseudopolydesmus euthetus (Chamberlin) 1942
Pseudopolydesmus minor (Bollman) 1888
Pseudopolydesmus natchitoches (Chamberlin) 1942
Pseudopolydesmus neoterus (Chamberlin) 1942
Pseudopolydesmus paludicolus Hoffman 1950
Pseudopolydesmus paroicus (Chamberlin) 1942
Pseudopolydesmus pinetorum (Bollman) 1888
Pseudopolydesmus serratus (Say) 1821
"It superficially resembles the introduced European species of the genus Polydesmus, hence the generic name, but . . . the dorsum is flatter and smoother." [from comment by Rowland Shelley]

Most Pseudopolydesmus are light pink to red. They have slightly impressed polygonal areas on their dorsum, and males have thickened legs in comparison to females. The gonopods of the males are rod-like simple structures with triangular processes along the lateral and medial sides, and lack an endomerite. They have a large hair-pad (pulvillus) about halfway up the length of the gonopod.
Endemic to eastern North America: Minnesota to Texas, east to Florida, north to Quebec.
Leaf litter, under logs
Hoffman 1999 lists 12 species for the genus, but it is in need of revision. This genus is one of the most commonly encountered in eastern North America.
See Also
Polydesmus: An introduced genus from Europe, Polydesmus is generally smaller, has dorsal polygonal areas that stand out more, males have an endomerite. Generally found in more urbanized or disturbed areas.
Scytonotus: Another endemic North American Polydesmid, Scytonotus is smaller and has many dorsal setae, giving it a slightly "fluffy" appearance. The gonopods of the males have an endomerite.