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In zoology, the green gland is a pair of excretory organs found in some crustaceans, such as crayfishes. These glands are typically located in the head region of the crustacean.12

The primary function of the green gland is excretion, meaning it helps the organism eliminate waste products. If the tubule adjacent to the excretory pore appears green, the gland is specifically referred to as a green gland. These glands are analogous to antennal or maxillary glands in other crustaceans, depending on their opening point.12

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