Archolaemus ferreirai

Archolaemus ferreirai is a species of glass knifefish endemic to Brazil where it is found in the Rio Mucajaí and Rio Uraricoera in the north-eastern portions of the Amazon basin. This species reaches a length of 34.2 cm.

Etymology
The knife fish is named in honor of Efrem Ferreira (b. 1954), of the Instituto Nacional de Pesquisas da Amazônia, who was one of the collectors of the type specimen.