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Existence of segmentation or metameres

Regarding the existence of segmentation (or metameres) in their body to which another already studied the phylum are arthropods proximal?

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Considering their metameric characteristic arthropods are proximal to annelids which too contain segmented bodies. In the embryonic growth of some arthropods there are fusions of metameres making structures such as, for illustration, the cephalothorax of arachnids.

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