Definition: The term "Lygaeoidea" is a phylum of marine invertebrates, characterized by their unique and highly specialized organs and structures found within their bodies. These organs are known as "lygmoceptors" or "lygaemic glands," which serve various functions such as temperature regulation, gas exchange, and nutrient absorption. The term encompasses a diverse range of organisms from the deep sea to the surface, encompassing everything from planktonic animals (like sponges) to macro
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