Univalve
Univalve refers to a mollusk, such as a snail or slug, that has a single, often coiled shell, distinguishing it from bivalves with two shells. In a broader sense, it describes any structure with a single valve or shell-like component, commonly used in biological classification to highlight evolutionary adaptations for protection and mobility in various environments.
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The nautilus, a type of univalve, has a shell divided into chambers that it uses like a submarine, filling them with gas to control buoyancy, allowing it to dive up to 500 meters deep in the ocean. This ancient creature has survived five mass extinctions and remains almost identical to fossils from 500 million years ago, making it a true living fossil.
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