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Subphylum Uniramia. Myriapods and InsectsHead: acron plus 4 segments: 1 pair antennae, 1 pair mandibles, 2 pair maxillaeUniramous limbsTracheal system for gas exchange air-breathersMalphigian tubules for excretion purines as nitrogenous waste product. Mandibles . Appendages of third post-acron segment, used for chewingBoth crustaceans and uniramians have mandibles.Homology or analogy?Uniramian jaws are inarticulate (one-piece), crustacean jaws are multiarticulate (jointed).

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