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Pariosternarchus amazonensis
''Pariosternarchus amazonensis'' is a little-known species of weakly electric knifefish in the family Apteronotidae, and the only member of its genus. It is found in the main channel of the Amazon River in Brazil and Peru, likely near the bottom in deep, fast-moving water. This species is characterized by a wide head with a flat bottom, and very large sensory canals along the lower jaw. Like several other knifefishes found in deep river channels, it has reduced eyes, scales, and body pigmentation.
==Taxonomy==
Ichthyologists James S. Albert and William G.R. Crampton described ''P. amazonensis'' in 2006, in the scientific journal ''Ichthyological Exploration of Freshwaters''; the type specimen is a long fish caught near the municipality of Alvarães in the Brazilian state of Amazonas. The authors coined for it the new genus ''Pariosternarchus'', from the Greek ''pario'' ("cheek", referring to the wide head), and ''sternon'' + ''archos'' ("chest" + "rectum", a commonly used name for apteronotids that refers to the anterior position of the urogenital opening). From morphological similarities, ''P. amazonensis'' is thought to belong to the navajini, an informal taxonomic group of apteronotids adapted to fast-flowing, large rivers, with the genus ''Sternarchella'' being its closest relatives.
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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