A small marine animal with a shell containing two parts and arm-like structures inside used for filtering food from water, extremely common as fossils from ancient oceans.
From Greek 'brachion' (arm) and 'pous' (foot), literally 'arm-foot'. The term was established in the 1800s because the creature's feeding arms looked like appendages, though scientists later realized they're not true arms.
Brachiopods are the ultimate success story of the ancient ocean—they dominated the seafloor for hundreds of millions of years and left more fossils than almost anything else, yet today only a few hundred species survive in deep waters like relics from another world.
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