Gnathostegite is a term used in the field of zoology to describe the hardened or chitinous plate that covers the anterior part of the thoracic segment in many crustaceans, such as crabs, lobsters, and shrimp. It forms part of the exoskeleton and is located between the cephalothorax and the first pair of walking legs. The gnathostegite functions as a protective shield for the underlying organs, including the mouthparts, and also plays a role in the manipulation and handling of food during feeding.
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