Eigenmannia

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.

Depending on the exact species, they have a maximum total length of 14.3-49.6 cm. They are nocturnal, and feed on small invertebrates such as aquatic insect larvae and zooplanktonic crustaceans.

Species
These are the currently recognized species in this genus:


 * Eigenmannia antonioi L. A. W. Peixoto, Dutra & Wosiacki, 2015
 * Eigenmannia besouro L. A. W. Peixoto & Wosiacki, 2016
 * Eigenmannia bumba Dutra, Ramos & Menezes, 2022
 * Eigenmannia cacuria Dutra, Ramos & Menezes, 2022
 * Eigenmannia correntes Campos-da-Paz & Queiroz, 2017
 * Eigenmannia desantanai L. A. W. Peixoto, Dutra & Wosiacki, 2015
 * Eigenmannia dutrai L. A. W. Peixoto, M. N. L. PASTANA, & Ballen, 2020
 * Eigenmannia goajira L. P. Schultz, 1949
 * Eigenmannia guairaca L. A. W. Peixoto, Dutra & Wosiacki, 2015
 * Eigenmannia humboldtii (Steindachner, 1878)
 * Eigenmannia limbata (Schreiner & A. Miranda-Ribeiro, 1903)
 * Eigenmannia loretana Waltz & Albert, 2018
 * Eigenmannia macrops (Boulenger, 1897)
 * Eigenmannia matintapereira L. A. W. Peixoto, Dutra & Wosiacki, 2015
 * Eigenmannia meeki Dutra, de Santana & Wosiacki, 2017
 * Eigenmannia microstoma (J. T. Reinhardt, 1852)
 * Eigenmannia muirapinima L. A. W. Peixoto, Dutra & Wosiacki, 2015
 * Eigenmannia nigra Mago-Leccia, 1994
 * Eigenmannia oradens Dutra, L. A. W. Peixoto, de Santana & Wosiacki, 2018
 * Eigenmannia pavulagem L. A. W. Peixoto, Dutra & Wosiacki, 2015
 * Eigenmannia robsoni Dutra, Ramos & Menezes, 2022
 * Eigenmannia sayona L. A. W. Peixoto & Waltz, 2017
 * Eigenmannia sirius L. A. W. Peixoto & Waltz, 2019
 * Eigenmannia trilineata R. B. López & Castello, 1966
 * Eigenmannia vicentespelaea Triques, 1996
 * Eigenmannia virescens (Valenciennes, 1836)
 * Eigenmannia waiwai L. A. W. Peixoto, Dutra & Wosiacki, 2015