Their bodies had been totally taken over by another organism, a bacterium, that had figured out how to replicate photosynthesis in the dark, through a process we now call chemosynthesis.
貝本体が全く別の細菌に 置き換わっていました　「化学合成」と呼ばれる過程で 暗闇で光合成と同等の過程を 行えるようになった細菌です