Uniramians are arthropods whose appendages are unbranched. Most appendages are made up of several articulating pieces. The uniramian body has two or three tagmata, and the abdomen contains numerous segments. The head appendages include paired antennae and mandibles, and also two pairs of maxillae (the second pair may be fused or sometimes absent). "Breathing" is by means of tracheae and spiracles. The sexes are separate, but most other aspects of reproduction are extremely varied.
This enormous group include millipedes, centipedes, and insects, plus two small, primitive classes, Pauropoda and Symphyla.
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Phil Myers (author), Museum of Zoology, University of Michigan-Ann Arbor.