Checklist of Gymnotiformes (Osteichthyes: Ostariophysi) and catalogue of primary types Author Ferraris, Carl J. Author Jr Author Santana, Carlos David de Author Vari, Richard P. text Neotropical Ichthyology 2017 2017-03-30 15 1 e 160067 1 8 http://dx.doi.org/10.1590/1982-0224-20160067 journal article 10.1590/1982-0224-20160067 1982-0224 6A7C7483-4945-4923-A859-ECEEEEF6F14B Gymnotus obscurus Crampton, Thorsen, Albert, 2005 Gymnotus obscurus Crampton, Thorsen, Albert, 2005: 91 , fig. 7. Type locality: Brazil , Amazonas , Mamirauá Reserve , Cano do Lago Mamirauá at Comunidade Boca do Mamirauá , 3°06’37”S , 64°47’49”W . Holotype : MZUSP 60604 ; 215 mm TL. Distribution: Mouth of Japurá River near Tefé, Amazonas, Brazil ( Crampton et al. , 2005 ). Gymnotus omarorum Richer-de-Forges, Crampton, Albert, 2009 Gymnotus omarorum Richer-de-Forges, Crampton, Albert, 2009: 539 , fig. 1. Type locality: Uruguay , Maldonado Department , Río Cisne basin, Laguna del Sauce , 34°50.328’S , 55°06.869’W . Holotype : ZVC-P 6480; 254 mm TL. Distribution: Uruguay River and coastal drainages of Uruguay ( Richer-de-Forges et al ., 2009 ).