Archolaemus santosi 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 21.2 cm (8.3 in).

[1][2] The knifefish is named in honor of Geraldo Mendes dos Santos of the Instituto Nacional de Pesquisas da Amazônia, who collected the type specimen.

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