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Tembeassu marauna
''Tembeassu marauna'' is a species of weakly electric knifefish in the family Apteronotidae and the only member of its genus, known only from three specimens collected from the upper Paraná River, Brazil, in 1965. This fish can be identified by fleshy extensions at the tips of its upper and lower jaws, with the upper extension bearing a patch of extra teeth. The function of these unique structures is unknown, but may relate to feeding. Apparently a specialized inhabitant of deep riverine environments, ''T. marauna'' may be endangered by extensive dam construction in the upper Paraná region.
==Taxonomy==
Brazilian ichthyologist Mauro Luís Triques described ''T. marauna'' in a 1998 volume of the scientific journal ''Revue française d'Aquariologie''. In 2001, James S. Albert referred this species to a monophyletic group he termed "''Apteronotus sensu stricto''", which placed ''Tembeassu'' in synonymy with ''Apteronotus''. However, a subsequent re-examination of the original specimens by Ricardo Campos-da-Paz in 2005 found that this species does not share the derived characters of ''Apteronotus''; Campos-da-Paz thus returned ''T. marauna'' to its own genus until its phylogenetic relationships can be better investigated.
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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