Gymnotiformes
The Gymnotiformes are a group of teleost bony fishes commonly known as the Neotropical or South American knifefish. They have long bodies and swim using undulations of their elongated anal fin.
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Electric eel
Ghost knifefish
Fish
Gymnotus
Fish
Apteronotus
Fish
Eigenmannia
Naked-back knifefish
Fish
Hypopomus
Hypopomidae
Sternopygus
Glass knifefish
Brachyhypopomus
Banded knifefish
Fish
Rhamphichthyidae
Adontosternarchus
Fish
Sternarchorhynchus