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Alpheus is a genus of snapping shrimp of the family Alpheidae. This genus contains in excess of 250 species, making this the most species-rich genus of shrimp. 

Like other snapping shrimp, the claws of Alpheus are asymmetrical, with one of the claws enlarged for making a popping noise. Some species in the genus enter into symbiotic relationships with gobiid fishes. It's also the noisiest of all sea creatures and can immobilize small fish with its high pitched frequency.