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Alpheidae
Alpheidae is a family of caridean snapping shrimp characterized by having asymmetrical claws, the larger of which is typically capable of producing a loud snapping sound. Other common names of these species include pistol shrimp or alpheid shrimp.
The family is diverse and worldwide in distribution, consisting of about 1119〔WoRMS〕 species within 38 or more genera. The two most prominent genera are ''Alpheus'' and ''Synalpheus'', with species numbering well over 250 and 100, respectively. Most snapping shrimp dig burrows and are common inhabitants of coral reefs, submerged seagrass flats and oyster reefs. While most genera and species are found in tropical and temperate coastal and marine waters, ''Betaeus'' inhabits cold seas and ''Potamalpheops'' is found only in freshwater caves.
When in colonies, the snapping shrimp can interfere with sonar and underwater communication.〔 The shrimp are a major source of noise in the ocean.
==Description==
The snapping shrimp grows to only long. It is distinctive for its remarkably disproportionate large claw, larger than half the shrimp's body. The claw can be on either arm of the body, and unlike most shrimp claws does not have typical pincers at the end. Rather, it has a pistol-like feature made of two parts. A joint allows the "hammer" part to move backward into a right-angled position. When released, it snaps into the other part of the claw, emitting an enormously powerful wave of bubbles capable of stunning larger fish and breaking small glass jars.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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