A pouch or sac-like structure in animals, especially in certain fish and insects; a gland or specialized body cavity.
From Latin 'crumena,' meaning a purse or pouch, borrowed into scientific English for anatomical descriptions. Used primarily in zoology and comparative anatomy.
Fish use crumens like living grocery bags—some store food, others store eggs or parasites, showing nature's creative reuse of pouches for completely different survival strategies across species.
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