A genus of marine bivalve mollusks (clams), named for their thick shells; sometimes refers to a specific type of thick-shelled clam.
From Latin 'crassus' (thick), referring to the characteristically thick shells of these mollusks. The feminine Latin ending '-a' was applied as a scientific genus name.
Scientists named these clams after their tough, thick shells—imagine being named 'Thickshell' in Latin because you're basically indestructible!
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