The Uniramia is a mainly abandoned taxon of arthropods, comprising the Hexapoda (insects and allies) and Myriapoda (centipedes, millipedes, and related forms). The uniting feature was the nature of the appendages on the head and the walking legs. The Crustacea were generally considered the closest relatives of the Uniramia, and sometimes were united as the Mandibulata. However, new studies suggest that the Myriapoda are not more closely related to the Hexapoda than the Crustacea, causing the Uniramia taxon to be abandoned. In proposals treating the arthropods as a polyphyletic group, the Onychophora were included here, but this had little support.
The Uniramia are a major group of Arthropoda, consisting of arthropods with a single pair of preoral antennae and a single pair of legs per segment, namely the Hexapoda (insects and allies) and Myriapoda (centipedes, millipedes, and related forms).
In Manton's original proposal, the Uniramia also included the Onychophora (velvet worms), but the discovery of fossil lobopods that are intermediate between onychophorans and arthropods is strong evidence for the two groups being separate.
The Crustacea were generally considered the closest relatives of the Uniramia, and sometimes these were united as Mandibulata.
The Uniramia are a group of arthropods, comprising the Hexapoda (insects and allies) and Myriapoda[?] (centipedes, millipedes, and related forms).
The Crustacea are generally considered the closest relatives of the Uniramia, and sometimes they are united as the Mandibulata.
However, new studies suggest that the Myriapoda are not be closer related to the Hexapoda than the Crustacea, in which case the Uniramia would be abandoned.
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