Considering the presence of segmentation (metameres) in their body to which other already studied phylum are arthropods proximal?

Considering the presence of segmentation (metameres) in their body to which other already studied phylum are arthropods proximal?
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Considering their metameric feature arthropods are proximal to annelids that also have segmented bodies. In the embryonic development of some arthropods there are fusions of metameres forming structures like, for example, the cephalothorax of arachnids. Phylum Arthropoda - Image Diversity: athropod cephalothorax
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