c. 50 [1] Platyrrhacidae Platyrhacidae is a family of polydesmidan millipedes distributed in Southeast Asia and tropical Central and South America.

[2][3] Large platyrhacids in Borneo may grow up to 13 cm (5.1 in) long and exhibit colors of blue, green, and yellow with black spots or stripes.

[6] The following genera have not yet been placed into a subfamily[6] The family (originally misspelled "Platyrrhacidae") was named by Reginald Pocock in 1895 to include the single genus Platyrhacus.

The North American genera Euryurus, Auturus, and Illiniurus, were long-considered to constitute a sub-group of Platyrhacidae (i.e. the subfamily Euryurinae or tribe Euryurini in various classifications), until separated as a distinct family (Euryuridae) by Hoffman in 1998 and allied closer to Xystodesmidae.

Similarly and concurrently, several neotropical genera previously placed in other subgroups of Platyrhacidae were removed and elevated to full family status: the Aphelidesmidae.