''Archolaemus'' is a genus of South American

glass knifefish Glass knifefishes are fishes in the family Sternopygidae in the order Gymnotiformes. Species are also known as rattail knifefishes. These fishes inhabit freshwater streams and rivers in Panama and South America. Many sternopygid species are sp ...

es. They occur in fast-flowing sections of rivers, including rapids, in the

Amazon Amazon most often refers to: * Amazons, a tribe of female warriors in Greek mythology * Amazon rainforest, a rainforest covering most of the Amazon basin * Amazon River, in South America * Amazon (company), an American multinational technolog ...

Tocantins Tocantins () is one of the 26 states of Brazil. It is the newest state, formed in 1988 and encompassing what had formerly been the northern two-fifths of the state of Goiás. Tocantins covers and had an estimated population of 1,496,880 in 20 ...

, São Francisco and

Araguari Araguari is a municipality in western Minas Gerais state, Brazil. It is in the northern Triângulo Mineiro region, on the Jordão River, a tributary of the Paranaíba River, at an elevation between . The municipality of Araguari has an area of , ...

basins. Depending on the exact species, they reach up to about 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.

Species

There are currently six recognized species in this genus:

References

Sternopygidae Freshwater fish of South America Freshwater fish genera {{Gymnotiformes-stub