Eigenmanniinae

Eigenmannia is a genus of fish in the family Sternopygidae (glass knifefishes) native to tropical and subtropical South America (south to the Río de la Plata Basin), and Panama. They are typically found in slow-flowing streams, along the edge of large rivers, in deep river channels and in floodplains, and the genus also includes E. vicentespelaea, the only cave-adapted knifefish. Eigenmannia are often found near submerged roots, aquatic plants and floating meadows.

Rhabdolichops is a genus of glass knifefishes found in Amazon, Orinoco and Maroni basins in tropical South America. They live near the bottom in main river channels, floodplains (including flooded forest like igapó) and lagoons, and are typically found in relatively deep waters.

REDIRECT Distocyclus conirostris

Rhinosternarchus is a monospecific genus of freshwater ray-finned fish belonging to the family Sternopygidae, the glass knifefishes. The only species in the genus is Rhinosternarchus goajira. This fish is found in the Lake Maracaibo basin in Colombia and Venezuela. Until 2021, it was placed in the genus Eigenmannia, but phylogenetic studies found it to be a distinct lineage most closely related to Archolaemus.

Archolaemus is a genus of South American glass knifefishes, family Sternopygidae. They occur in fast-flowing sections of rivers, including rapids, in the Amazon, Tocantins, São Francisco and Araguari 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.