Archolaemus is a genus of South American glass knifefishes, family Sternopygidae.[1] They occur in fast-flowing sections of rivers, including rapids, in the Amazon, Tocantins, São Francisco and Araguari basins.[1] Depending on the exact species, they reach up to about NaNabbr=onNaNabbr=on in total length. During the day they hide in rocky crevices, but during the night they are active and feed on small invertebrates such as aquatic insect larvae.[1]
There are currently six recognized species in this genus:[1]