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Asian swamp eel
The Asian swamp eel, swamp eel, rice eel, or white ricefield eel (''Monopterus albus'') is a commercially important, air-breathing species of fish in the Synbranchidae family. Originating in the waters of East and Southeast Asia, it has been identified as an invasive species in the North American Everglades.
==Taxonomy and evolution==
The Asian swamp eel is a freshwater eel-like fish belonging to the family Synbranchidae. This family is native to the fresh, brackish, tropical, and subtropical waters of Asia, but is now present in West Africa and North, Central, and South America.〔Nelson, J.S. Fishes of the World. 3rd. New York City: John Wiley & Sons, Inc., 1994. Print.〕 Its taxonomy, however, is incorrect. Though ''Monopterus albus'' was initially thought to be a single species, four known populations of the “species” in the southeastern United States may actually be three distinct species or taxa,〔Fuller, P.L., L.G. Nico, and M. Cannister. ( 11 30 2010). ("Asian swamp eel." Nonindigenous Aquatic Species ). ''United States Geological Survey''. Retrieved 15 Mar 2011.〕 each originating from a different area in Asia.〔Collins, Timothy M., Joel C. Trexler, Leo G. Nico, and Timothy A. Rawlings (2002). "Genetic Diversity in a Morphologically Conservative Invasive Taxon: Multiple Introductions of Swamp Eels to the Southeastern United States." Conservation Biology. 16.4: 1024-1035. Print.〕
''Monopterus albus'' is placed in the class or subclass Actinopterygii. It arose from the Osteichthyes, the first bony fish, whose fossil record dates back to the Triassic period. In turn, the bony fish came from the Acanthodii class of bony and cartilaginous fish. The common name of ''M. albus'' is somewhat of a misnomer, as the Asian swamp eel is not an eel, ''per se''. Eels are of the order Anguilliformes, while ''M. albus'' is of the order Synbranchiformes.
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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