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In page Onychophora:

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On the first head segment is a pair of slender antennae, which serve in sensory perception. They probably do not correspond directly to the antennae of the Arthropoda,[1] but perhaps rather with their "lips" or labrum. At their base is a pair of simple eyes, except in a few blind species. In front of these, in many Australian species, are various dimples, whose function is not yet clear. It appears that in at least some species, these serve in the transfer of sperm-cell packages (spermatophores).[citation needed]