What is the uniqueness about the first two pairs of cephalic appendages of a crustacean compared to those of the other extant arthropods?
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The body of crustaceans is composed of many segments which are called Somites. Each Somite can bear a pair of appendages. The first two pairs of cephalic appendages have the first and second antennae. Whereas all other arthropods have one pair of antennae or none. Crustaceans also possess biramous appendages, each of which consist of a basal segment, called the protopodite.
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