Having two valves or shell-like parts; characteristic of or relating to bivalves.
From Latin 'bi-' (two) + 'valvous' (having valves), derived from 'valva' (folding shell). The '-ous' suffix indicates the quality of possessing something.
The bivalvous structure is so successful that it hasn't changed much in 500 million years—it's a design so efficient that evolution sees no need to improve it! The same basic two-shell system works for creatures from tiny clams to giant geoducks.
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