Trichopolydesmidae
Trichopolydesmidae is a family of millipedes belonging to the order Polydesmida. This family includes two genera (''Galliocookia'' and ''Occitanocookia'') notable for featuring sexual dimorphism in segment number: adult females in these genera have the 20 segments (including the telson) usually found in this order, but adult males have only 19. This family also includes the species ''Deharvengius bedosae'', notable for being among the very few species in this order to feature adults with only 18 segments rather than the 20 segments usually found in polydesmids. Genera This family includes the following genera: * ''Aporodesmella'' Golovatch, Geoffroy & VandenSpiegel, 2014 * ''Bacillidesmus'' Attems, 1898 * ''Balkanodesmus'' Antić & Reip, 2014 * ''Banatodesmus'' Tabacaru, 1980 * ''Cottodesmus'' Verhoeff, 1936 * ''Deharvengius'' Golovatch, Geoffroy & VandenSpiegel, 2013 * ''Galliocookia'' Ribaut, 1955 * ''Gonatodesmus'' Golovatch, Geoffroy & VandenSpiegel, 2013 * ''Haplocookia'' Brà ...
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Polydesmida
Polydesmida (from the Greek language, Greek ''poly'' "many" and ''desmos'' "bond") is the largest order (biology), order of millipedes, containing approximately 3,500 species, including all the millipedes reported to produce hydrogen cyanide (HCN). Description Members of the order Polydesmida are also known as "flat-backed millipedes", because on most species, each body segment has wide lateral keels known as paranota. These keels are produced by the posterior half (metazonite) of each body ring behind the collum (millipedes), collum. Polydesmids have no eyes, and vary in length from . Many of the larger species show bright coloration patterns which warn predators of their toxic secretions. Adults usually have 20 segments, counting the collum as the first ring and the telson as the last ring. juvenile (organism), Juveniles have from 7 to 19 rings. In species with the usual 20 segments, adult females have 31 pairs of legs, but in adult males, the eighth leg pair (the first leg pai ...
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