ResumenNeotropical electric fishes (Teleostei, Gymnotiformes), also called American knifefishes, are an important component of the nocturnal ichthyological fauna in Middle and South America. As with many Neotropical fishes, the actual diversity of Gymnotiforms has only come to be appreciated in recent years. The present number of Gymnotiforms is much higher than was previously recognized, with 131 valid species currently reported in the literature and at least 39 additional and undescribed species are currently known in museum collections (Albert unpubl. obs.)
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