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 .
Etymology 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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