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Nematocera (subclass Pterygota, order Diptera) Suborder of flies in which the adults usually have long, thin antennae of not less than six segments, which are more or less uniform, and unfused. If the antennae are short, members of the suborder may be recognized by their pendulous, multi-segmented palpi. In many species the larvae have well-developed, biting mandibles. The pupae are obtect, and normally free. There are about 21 families with world-wide distribution.