Millipedes in the order Siphonophorida are long and worm-like, reaching up to 36 millimetres (1.4 in) in length and up to 190 body segments.

Eyes are absent, and in many species the head is elongated into a long beak, with mandibles highly reduced.

Each body segment consists of a dorsal tergite, two lateral pleurites, and ventral sternite, which are unfused.

[2] Siphonophorida occurs from southwestern USA to Brazil and Peru in the western hemisphere, as well as South Africa, India, southeast Asia and Australia.

[3] The oldest fossil of the group is from the Late Cretaceous (Cenomanian) aged Burmese amber, assignable to the extant genus Siphonophora.