An external jaw appendage or structure in certain arthropods, particularly crustaceans.
From 'exognathion' or 'exo-' (outside) + 'gnath' (jaw) combined with '-ite' (mineral or rock suffix, here used for anatomical structures).
Shrimps and lobsters have exognathites—extra jaw-like limbs near their mouths—that evolved to help them manipulate food and feed more efficiently than their ancestors!
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