Fig. 3
From: The diversity and evolution of electric organs in Neotropical knifefishes
A simplified phylogenetic tree of Gymnotiformes, within which the Gymnotidae, Rhamphichthyoidea and Sinusoidea are considered in parallel. Notable example species are given, along with the corresponding presence of a myogenic electric organ (mEO) with Type A or Type B electrocytes and/or a neurogenic electric organ (nEO) [1, 31]