Abstract
Apteronotus eschmeyeri n. sp. is described here from the Magdalena Basin in Colombia and distinguished from congeners by the following combination of features: blotchy coloration on body, clear band from chin to the beginning of dorsal mid-saggital electroreceptororgan, two clear bands surrounding the caudal peduncle in specimens up to 165 mm TL, mouth rictus passing the posterior margin of orbit. The present work demonstrates that the Trans-Andean apteronotids may be more diverse than previously supposed.References
Albert, J.S. (2001) Species diversity and phylogenetic systematics of American knifefishes (Gymnotiformes, Teleostei). Miscellaneous Publications, Museum of Zoology, University of Michigan, 190, 1–129.
Albert, J.S. (2003) Gymnotiformes: Apteronotidae – ghost knifefishes. In: Check List of the Freshwater Fishes of South and Central America. Edipucrs, Porto Alegre, Brazil, pp. 497–502.
Albert. J.S. & Campos-da-Paz, R. (1998) Phylogenetic systematics of Gymnotiformes with diagnoses of 58 clades: a review of avaliable data. In: Malabarba, L.R., Reis, R.E., Vari, R.P. Lucena, Z. M. S. & Lucena, C. A. S. (Eds), Phylogeny and Classification of Neotropical Fishes. Edipucrs, Porto Alegre, Brazil, pp. 419–446.
Campos-da-Paz, R. (1999) New species of Megadontognathus from the Amazon Basin, with phylogenetic and taxonomic discussions on the genus (Gymnotiformes: Apteronotidae). Copeia, 1999, 1041–1049.
Cox-Fernandes, C. (1998) Sex-related morphological variation in two apteronotid fishes (Gymnotiformes) from the Amazon River Basin. Copeia, 1998, 730–735.
Cox-Fernandes, C, Lundberg, J. G. & Riginos, C. (2002) Largest of all electric-fish snouts: hypermorphicfacial growth in male Apteronotus hasemani and the identity of Apteronotus anas (Gymnotiformes: Apteronotidae). Copeia, 2002, 52–61.
Dahl, G. (1971) Los peces del norte de Colombia. Instituto de Dessarrollo de Los Recursos Naturale Renovables. Bogotá, 391 pp.
Eigenmann, C. H. (1922) The fishes of western South America, Part I. The fresh-water fishes of northwestern South America, including Colombia, Panama, and Pacific slopes of Ecuador and Peru, together with an appendix upon the fishes of the Rio Meta in Colombia. Memoirs of the Carnegie Museum, 9 (1), 1–346.
Eigenmann, C. H. & Fisher, H. G. (1914 ) The Gymnotidae of Trans-Andean Colombia and Equador. Indiana University Studies, 25, 235–237.
Eschmeyer, W. N. (1998) Catalog of Fishes. San Francisco. California Academy of Sciences, 1, 956 pp.
Fowler, H. W. (1944) Fresh-water fishes from northwestern Colombia. Proceedings of the Academy of Natural Sciences of Philadelphia, 96, 227–248.
Maldonado-Ocampo, J. A., & Albert, J. S. (in press) Species diversity of gymnotiforms (Teleostei, Gymnotiformes) fishes in Colombia. Biota Colombiana.
Mago-Leccia, F. (1994) Electric Fishes of Continental Waters of America. Fundacion para el Desarrollo de las Ciencias Fisicas, Matematicas y Naturales, 207 pp.
Meek, S. E. & Hildebrand, S. F. (1913) New species of fishes from Panamá. Field Museum of Natural History, Series Zoology. No. 166, 10 (8), 77–91.
Miles, C. (1945) Some newly recorded fishes from the Magdalena river system. Caldasia, 3(15), 453–464.
Regan, C. T. (1914) Fishes from the Condoto River, Colombia, collected by Dr. H. G. F. Spurrell. The Annals and Magazine of Natural History, 14 (8), 31–33.
de Santana, C.D. (2002) “Apteronotus” (sensu stricto) (Gymnotiformes: Apteronotidae): monofiletismo, sistemática, e diversidade subestimada em peixes elétricos Neotropicais. Unpubl. Master’s thesis, Universidade Federal de Pernambuco, Pernambuco, Brazil, 394pp.
de Santana, C.D. (2003) Apteronotus caudimaculosus n. sp. (Gymnotiformes: Apteronotidae), a sexually dimorphic black ghost knifefish from the Pantanal, Western Brazil, with a note on the monophyly of the A. albifrons species complex. Zootaxa, 252, 1–11.
Schultz, L. P. (1949) A further contribution to the ichthyology of Venezuela. Proceedings of the United States National Museum, 99, 1–211.