Sternarchella, Eigenmann, 1905

Evans, Kory M., Crampton, William G. R. & Albert, James S., 2017, Taxonomic revision of the deep channel electric fish genus Sternarchella (Teleostei: Gymnotiformes: Apteronotidae), with descriptions of two new species, Neotropical Ichthyology 15 (2), No. e 160168, pp. 1-30 : 5

Key to the adults of the genus Sternarchella with notes on distribution

1a. Mouth terminal or superior; interorbital distance small, less than 20% HL .......................................................... 2

1b. Mouth sub-terminal; four rows of teeth present on premaxilla................................................................ 3

2a. PA less than 50% head length; 0-1 rows of intermuscular bones visible in caudal peduncle ................................... 4

2b. PA greater than 50% head length; 2 rows of intermuscular bones visible in caudal peduncle ................................... 5

3a. Tail length exceeds head length; interorbital distance small, less than 20% HL........................ S. orinoco (OR)

3b. Tail length less than head length; body depth equal or greater than HL........................................... S. sima (EA) Synonymy of Magosternarchus . We recovered a paraphyletic Sternarchella , with Magosternarchus nested inside it ( Fig. 5). This topology was also recovered in Ivanyisky, Albert (2014) and Tagliacollo et al. (2016). A recent paper by Ferraris et al. (2017) recently used the name “ Sternarchella ” in reference to the Magosternarchus species citing the findings from Ivanyisky, Albert (2014) as grounds for synonomy. However, in the aforementioned manuscript, no formal synonomy was ever provided. Consequently, we herein recognize the genus Magosternarchus as a junior synonym of Sternarchella and we refer to M. duccis and M. raptor as S. duccis and S. raptor , respectively.