GRC

πτύξαγρις

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LSJ

and πύξαγρις, ὁ, name of the crab which extracts the flesh of the oyster from its shell by putting a small stone between the valves (πτύχες or πυξία), Zonar.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
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