Polydesmidae is a family of

millipede Millipedes are a group of arthropods that are characterised by having two pairs of jointed legs on most body segments; they are known scientifically as the class Diplopoda, the name derived from this feature. Each double-legged segment is a resu ...

s in the order

Polydesmida Polydesmida (from the Greek ''poly'' "many" and ''desmos'' "bond") is the largest order of millipedes, containing approximately 3,500 species, including all the millipedes reported to produce hydrogen cyanide (HCN). Description Members of the o ...

. These millipedes range from 4 mm to 30 mm in length. This family includes species notable for featuring

sexual dimorphism Sexual dimorphism is the condition where the sexes of the same animal and/or plant species exhibit different morphological characteristics, particularly characteristics not directly involved in reproduction. The condition occurs in most an ...

in segment number: Adult females in the genus ''Perapolydesmus'' have the usual 20 segments (counting the collum as the first segment and the

telson The telson () is the posterior-most division of the body of an arthropod. Depending on the definition, the telson is either considered to be the final segment of the arthropod body, or an additional division that is not a true segment on accou ...

as the last), but the adult males have only 19.

Genera

*'' Antrochodus'' *'' Archipolydesmus '' *'' Basicentrus '' *'' Bhutanodesmus '' *'' Bidentogon '' *'' Bosniodesmus '' *'' Bosporodesmus '' *'' Brachydesmus '' *'' Brembosoma '' *'' Calianotus '' *'' Chromobrachydesmus'' *''

Cookia ''Cookia'' is a genus of large sea snails, marine gastropod molluscs in the family Turbinidae Turbinidae, the turban snails, are a family of small to large marine gastropod molluscs in the superfamily Trochoidea.Bouchet, P. (2014). Turbin ...

'' *'' Cretodesmus'' *'' Dixidesmus '' *'' Epanerchodus '' *'' Eumastigonodesmus'' *'' Goniodesmus '' *'' Haplobrachidesmus'' *'' Haplocookia '' *'' Heterocookia '' *'' Himalodesmus '' *'' Hispaniodesmus '' *'' Huzichodus '' *''

Jaxartes The Syr Darya (, ),, , ; rus, Сырдарья́, Syrdarjja, p=sɨrdɐˈrʲja; fa, سيردريا, Sirdaryâ; tg, Сирдарё, Sirdaryo; tr, Seyhun, Siri Derya; ar, سيحون, Seyḥūn; uz, Sirdaryo, script-Latn/. historically known ...

'' *'' Kirgisdesmus '' *'' Leptobrachydesmus'' *'' Lophobrachydesmus '' *'' Mastigonodesmus '' *'' Mastuchus '' *'' Merioceratium '' *'' Niponchodus '' *'' Nipponesmus '' *'' Nomarchus '' *'' Pacidesmus '' *'' Peltogonopus '' *'' Perapolydesmus '' *'' Polydesmus '' *'' Prionomatis '' *'' Propolydesmus '' *'' Pseudopolydesmus '' *'' Retrorsia '' *'' Riuerchodus '' *'' Sardodesmus '' *'' Schedoleiodesmus'' *'' Schizobrachydesmus '' *'' Schizomeritius'' *'' Schizoturanius'' *'' Scytonotus'' *'' Serradium'' *'' Spanobrachium'' *'' Speodesmus'' *'' Stylobrachydesmus'' *'' Telopoditius'' *'' Tolosanius'' *'' Trachynotus'' *'' Troglobrachydesmus'' *'' Turanodesmus'' *'' Uniramidesmus'' *'' Usbekodesmus'' *'' Utadesmus''

References

Polydesmida Millipede families {{Myriapoda-stub