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Eduncle Best Answer
Research indicates that they are either modified arthropods or represent a link between annelids and arthropods, most recent molecular phylogenies favor the first hypothesis. Onychophorans were previously grouped under arthropods, but recently they are considered to be a separate phylum that is closely related to the arthropods. They have many similarities with both annelids and arthropods, and have been described as a missing link between the two groups.