Tamandua Knifefish
Orthosternarchus tamandua
- Least concern
- Card rarity: Common
- Fish

Orthosternarchus is a monospecific genus of weakly electric knifefish in the family Apteronotidae. The only species in the genus is Orthosternarchus tamandua, the tamandua knifefish. This knifefish is native to the deep river channels of the Amazon basin. This species is characterized by its whitish-pink color, long tubular snout, long dorsal appendage, and tiny, bilaterally asymmetrical eyes. It is one of two species in the subfamily Sternarchorhamphinae.
Classification
- Class
- Actinopterygii
- Order
- Gymnotiformes
- Family
- Apteronotidae
- Genus
- Orthosternarchus