A free-swimming bivalve mollusc, the shell of which is typically white and has a rough, ribbed external surface.
- Family Limidae
- The crab was presumably going to try to break it open as soon as possible, but the file shell's acid secretions may have permitted a last-minute escape.
- The file shell, like the scallop, can move very rapidly by clapping its shells together.
- A spiny file shell can use its foot to bounce up from the bottom and can swim, but file shells have no eyes.
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