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The mandibulates constitute the largest and most varied arthropod group. Mandibulates also differ by having antennae, and also by having three distinct body regions: head, thorax and abdomen (the prosoma of chelicerates is not a fusion of head and thorax, although often called a cephalothorax). — “Mandible (arthropod) - Wikipedia, the free encyclopedia”, en.wikipedia.org
Thus, in Budd's view, the order of the two anterior appendages of taxa such as Fuxianhuia are reversed: the antennae are the first antennae (deutocerebral) of the mandibulates; and the great appendages correspond to the primary antennae of the onychophorans and Cambrian lobopods. — “Arthropod head problem - Wikipedia, the free encyclopedia”, en.wikipedia.org
Mandibles are present in the extant subphyla Myriapoda (millipedes and others), Crustacea and Hexapoda (insects etc.). These groups make up the clade Mandibulata, which is currently believed to be the sister group to the rest of Mandibulates also differ by having antennae, and also by having three. — “Mandible (arthropod mouthpart) - Wikipedia, the free encyclopedia”, en.wikipedia.org