(having two major branches) leg-like structures, as seen in some modern crustaceans and fossil trilobites. Crustaceans have two pairs of antennae, and all non-crustacean arthropods have a single pair of antennae, except for the chelicerates and proturans, which have none.

Crustaceans

Crustaceans bear two pairs of antennae. The pair attached to the first

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