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Sternopygus macrurus
 (Bloch & Schneider, 1801)
  Family: Sternopygidae (Glass Knifefishes) / Order: Gymnotiformes (Knifefishes)
  
  Common names Distribution Environment Fish  
  UK: Longtail Knifefish
DK: (Knivfisk)		 South America:
Peru, Ecuador, Brazil & Guianas Shield		 Freshwater
22-28ºC / pH 6-6½		 Max Size: 141 cm