12: See text Anocheta Cook, 1895 Haplogonophora Brolemann, 1931 Spirobolida is an order of "round-backed" millipedes containing approximately 500 species in 12 families.

[1] Its members are distinguished by the presence of a "pronounced suture that runs "vertically down the front of the head".

[2] Most of the species live in the tropics, and many are brightly coloured.

[2] Mature males have two pairs of modified legs, the gonopods, consisting of the 8th and 9th leg pair: the posterior gonopods are used in sperm-transfer while the anterior gonopods are fused into a single plate-like structure.

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