After Nelson, 1994, Albert & Crampton, 2005, and Correa, Crampton & Albert,, 2006, with Recent species from Froese & Pauly, 2001 [“The Fishbase”]

<==o Sternopygidae (“lasiveitsikalat”) [N: 5/15] [FB: 5/23]
   |?- Sternachus [not recognize by the Fishbase, nor by Albert & Crampton]
   |?- †Humboldtichthys kirschbaumi (Gayet et al., 1994) Gayet & Meunier, 2000 [Ellisella kirschbaumi Gayet et al., 1994]
   |--o Sternopygus Müller & Troschel, 1849 [A&C: 9+1]
   |  |--o S. aequilabiatus (Humboldt, 1805)
   |  |  |-- S. a. aequilabiatus (Humboldt, 1805)
   |  |  |-- S. a. arenatus (Eydoux & Souleyet, 1850)
   |  |  |-- S. a. dariensis Meek & Hildebrand, 1916
   |  |  `-- S. a. pejeraton Schultz, 1949
   |  |-- S. astrabes Mago-Leccia, 1994
   |  |-- S. castroi Triques, 1999
   |  |-- S. macrurus (Bloch & Schneider, 1801) (Longtail knifefish)
   |  `-- S. xingu Albert & Fink, 1996
   `--+-- Archolaemus blax Korringa, 1970
      `--+--o Distocyclus Mago-Leccia, 1994 [2]
         |  |-- D. conirostris (Eigenmann & Allen, 1942)
         |  `-- D. goajira (Schultz, 1949)
         |==o Eigenmannia Jordan & Evermann, 1896 [A&C: 8+3] [paraphyletic]
         |  |-- E. humboldtii (Steindachner, 1878)
         |  |-- E. limbata (Schreiner & Miranda-Ribeiro, 1903)
         |  |-- E. macrops (Boulenger, 1897)
         |  |-- E. microstoma (Reinhardt, 1852)
         |  |-- E. nigra Mago-Leccia, 1994
         |  |-- E. trilineata López & Castello, 1966
         |  `-- E. vicentespelaea Triques, 1996
         `--+-- Eigenmannia virescens (Valenciennes, 1842) (kärsäveitsikala; Glass knifefish)
            `--o Rhabdolichops Eigenmann & Allen, 1942 [A&C: 8+2]
               |?- R. jegui Keith & Meunier, 2000 [not treated phylogenetically by Correa, Crampton & Albert, 2006]
               |--+-- R. nigrimans Correa, Crampton & Albert, 2006
               |  `-- R. lundbergi Correa, Crampton & Albert, 2006
               `--+-- R. electrogrammus Lundberg & Mago-Leccia, 1986
                  `--+-- R. zareti Lundberg & Mago-Leccia, 1986
                     `--+-- R. eastwardi Lundberg & Mago-Leccia, 1986
                        |--+-- R. navalha Correa, Crampton & Albert, 2006
                        |  `-- R. stewarti Lundberg & Mago-Leccia, 1986
                        `--+-- R. caviceps (Fernández-Yépez, 1968)
                           `-- R. troscheli (Kaup, 1856)

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