Alpheus is a genus of snapping shrimp of the family Alpheidae. The snapping shrimp grows to only long. The tiger pistol shrimp (Alpheus bellulus) belongs to the family of snapping shrimp. Alpheus randalli is a species of snapping shrimp in the genus "Alpheus". "Synalpheus microneptunus" belongs to the genus "Synalpheus" of the snapping shrimp family, Alpheidae. This phenomenon of claw symmetry in snapping shrimp has only been documented once in nature. The bigclaw snapping shrimp produces a loud, staccato concussive noise with its snapping claw. When in colonies, the snapping shrimp can interfere with sonar and underwater communication. "Alpheus randalli" is a medium-sized snapping shrimp growing to about long. Such behaviors are seen in the snapping shrimp "Synalpheus regalis" and gall-forming aphid "Pemphigus spyrothecae".