A genus of crabs commonly known as fiddler crabs, distinguished by their highly asymmetrical claws and burrowing behavior in tidal zones.
From Latin 'gelasinus' (from Greek 'gelastikos', relating to laughter), supposedly because the crab's claw movements resemble a laughing gesture. The scientific name was applied by Linnaeus in the 1700s.
Fiddler crabs (Gelasimus) wave their enormous claws at each other in elaborate patterns that look like they're laughing or fiddling—scientists named an entire genus after this behavior!
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