4. (Science: zoology) The organ of insects which covers the mouth beneath, and serves as an under lip. It consists of the second pair of maxillae, usually closely united in the middle line, but bearing a pair of palpi in most insects. It often consists of a thin anterior part (ligula or palpiger) and a firmer posterior plate (mentum). Inner margin of the aperture of a shell.
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... segments), thorax (3 segments) and abdomen (6-12 segments depending on position in systematics) - they have a pair antennae, mandibles, labrum and labium that are modified complex of appendages called maxillae. All appendages I mentioned together are called mouthparts - they have about 6 types ...
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