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Spirobolida is an order of "round-backed" containing approximately 500 species in 12 families. Its members are distinguished by the presence of a "pronounced suture that runs "vertically down the front of the head".Stephen P. Hopkin & Helen J. Read (1992). 9780198576990, Oxford University Press. . ISBN 9780198576990 Most of the species live in the tropics, and many are brightly coloured. Mature males have two pairs of modified legs, the , 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.
The families are divided into two suborders:
Suborder Spirobolidea
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