A genus of small bivalve mollusks (clams) that burrow into limestone and coral rocks.
From Greek 'gastro-' (stomach) and 'chaena' (gape or opening), referring to the wide opening of the shell. The name describes the shell's characteristic gaping appearance.
These tiny clams are geological engineers—they dissolve rock with acidic chemicals to create their homes, and their tunnels can eventually weaken entire coral structures, making them surprisingly powerful creatures.
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