A scientist who studies crustaceans, which are animals like crabs, lobsters, and shrimp that have hard outer shells and many legs.
From crustacean (Latin crusta 'shell' + -aceus 'made of') combined with -ologist (Greek logos 'study'). The suffix -ologist means 'one who studies,' so this describes an expert in crustacean science.
The ocean is absolutely full of crustaceans—they're some of the most diverse animals on Earth with over 67,000 species—yet crustaceologists are still discovering new ones regularly, even in the deep sea where the pressure would crush us instantly.
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