Two new, remarkably colored species of the Neotropical catfish genus Cetopsorhamdia Eigenmann & Fisher, 1916 (Siluriformes, Heptapteridae) from Chapada dos Parecis, western Brazil, with an assessment of the morphological characters bearing on their phylogenetic relationships


  • Flávio A. Bockmann Universidade de São Paulo (USP), Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto (FFCLRP), Departamento de Biologia (DB), Laboratório de Ictiologia de Ribeirão Preto, Programa de Pós-Graduação em Biologia Comparada.
  • Roberto E. Reis Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Escola de Ciências da Saúde e da Vida, Laboratório de Sistemática de Vertebrados. Porto Alegre, RS, Brasil.



Systematics, Ichthyology, Taxonomy, South America


Two new species of heptapterid catfish genus Cetopsorhamdia are described from close localities in western Brazil, at Chapada dos Parecis, an area with extremely high level of endemism. One species is from the upper Rio Madeira system, Rondônia State, and the other from the upper Rio Tapajós system, Mato Grosso State. The two species are diagnosed, among several other features, by their markedly distinctive color patterns, with the former having well-defined quadrangular marks in trunk flanks while the latter bearing irregular, vertical bars along the trunk. The monophyly of Cetopsorhamdia is discussed, with two putative synapomorphies being proposed to support the genus. Potentially informative morphological characters to resolve the internal relationships of the genus are presented and discussed. Despite the striking external differences between the two species herein described, they are found to likely form a clade.


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Arratia, G. & Huaquín, L. 1995. Morphology of the lateral line system and of the skin of diplomystid and certain primitive loricarioid catfishes and systematic and ecological considerations. Bonner Zoologische Monographien, 36: 1-110.

Bertaco, V.A. & Carvalho, T.P. 2005a. A new characid fish, Hyphessobrycon hexastichos (Characiformes: Characidae) from Chapada dos Parecis, Mato Grosso, Brazil. Neotropical Ichthyology, 3(3): 439-443.

Bertaco, V.A. & Carvalho, T.P. 2005b. New characid fish, Hemigrammus skolioplatus (Characiformes: Characida) from upper rio Tapajós drainage, Central Brazil. Comunicações do Museu de Ciências e Tecnologia PUCRS, Série Zoologia, 18(2): 141-150.

Bertaco, V.A. & Malabarba, L.R. 2007. A new species of Hasemania from the Upper Rio Tapajós drainage, Brazil (Teleostei: Characiformes: Characidae). Copeia, 2007(2): 350-354.[350:ANSOHF]2.0.CO;2

Bichuette, M.E. & Trajano, E. 2005. A new cave species of Rhamdia (Siluriformes: Heptapteridae) from Serra do Ramalho, northeastern Brazil, with notes on ecology and behavior. Neotropical Ichthyology, 3(4): 587-595.

Bockmann, F.A. 1994. Description of Mastiglanis asopos, a new pimelodid catfish from northern Brazil, with comments on phylogenetic relationship inside the subfamily Rhamdiinae (Siluriformes: Pimelodidae). Proceedings of the Biological Society of Washington, 107(4): 760-777.

Bockmann, F.A. 1998. Análise filogenética da família Heptapteridae (Teleostei, Ostariophysi, Siluriformes) e redefinição de seus gêneros. Doctoral Thesis. Universidade de São Paulo, São Paulo.

Bockmann, F.A. & Castro, R.M.C. 2010. The blind catfish from the caves of Chapada Diamantina, Bahia, Brazil (Siluriformes: Heptapteridae): description, anatomy, phylogenetic relationships, natural history, and biogeography. Neotropical Ichthyology, 8(4): 673-706.

Bockmann, F.A. & de Pinna, M.C.C. 2004. Heptapterus collettii Steindachner, 1881: a member of the Asian bagrid genus Olyra erroneously assigned to the neotropical fauna. Copeia, 2004(3): 665-675.

Bockmann, F.A. & Ferraris-Jr., C.J. 2005. Systematics of the Neotropical catfish genera Nemuroglanis Eigenmann and Eigenmann 1889, Imparales Schultz 1944, and Medemichthys Dahl 1961 (Siluriformes: Heptapteridae). Copeia, 2005(1): 124-137.

Bockmann, F.A. & Guazzelli, G.M. 2003. Family Heptapteridae (Heptapterids). In: Reis, R.E.; Kullander, S.O. & Ferraris-Jr., C.J. (Eds.). Check list of the freshwater fishes of South and Central America. Porto Alegre, Edipucrs. p. 406-431.

Bockmann, F.A. & Miquelarena, A.M. 2008. Anatomy and phylogenetic relationships of a new catfish species from northeastern Argentina with comments on the phylogenetic relationships of the genus Rhamdella Eigenmann and Eigenmann 1888 (Siluriformes, Heptapteridae). Zootaxa, 1780: 1-54.

Bockmann, F.A. & Reis, R.E. 2011. Two new, beautifully-colored species of the Neotropical catfish Cetopsorhamdia Eigenmann and Fishes, 1916 (Siluriformes, Heptapteridae) from western Brazil, with a cladistic analysis of the genus. In: Abstracts for the 2011 Joint Meeting of Ichthyologists and Herpetologists, Minneapolis, Minnesota, 6-11 July 2011. Minneapolis, AES, ASIH, HL, NIA, SSAR, unnumb. p. [CD-ROM]

Bockmann, F.A. & Slobodian, V. 2013. Heptapteridae. In: Queiroz, L.J.; Torrente-Vilara, G.; Ohara, W.M.; Silva, T.H.P.; Zuanon, J. & Doria, C.R.C. (Eds.). Peixes do Rio Madeira. São Paulo, Dialeto. v. 3, p. 14-77.

Bockmann, F.A. & Slobodian, V. 2018. Heptapteridae. In: van der Sleen, P. & Albert, J.S. (Eds.). Field guide to the fishes of the Amazon, Orinoco, and Guianas. New Jersey, Princeton University Press. p. 233-252.

Britski, H.A. 1993. Uma nova espécie de Phenacorhamdia da bacia do Alto Paraná (Pisces, Siluriformes). Comunicações do Museu de Ciências da Pontifícia Universidade Católica do Rio Grande do Sul, série zoologia, 6: 41-50.

Britski, H.A. & Lima, F.C.T. 2008. A new species of Hemigrammus from the Upper Rio Tapajós Basin in Brazil (Teleostei: Characiformes: Characidae). Copeia, 2008(3): 565-569.

Carvalho, T.P. & Bertaco, V.A. 2006. Two new species of Hyphessobrycon (Teleostei: Characidae) from upper rio Tapajós basin on Chapada dos Parecis, central Brazil. Neotropical Ichthyology, 4(3): 301-308.

Dagosta, F.C.P. & de Pinna, M. 2019. The fishes of the Amazon: distribution and biogeographical patterns, with a comprehensive list of species. Bulletin of the American Museum of Natural History, 431: 1-163.

DoNascimiento, C. & Milani, N. 2008. The Venezuelan species of Phenacorhamdia (Siluriformes: Heptapteridae), with the description of two new species and a remarkable new tooth morphology for siluriforms. Proceedings of the Academy of Natural Sciences of Philadelphia, 157(1): 163-180.[163:TVSOPS]2.0.CO;2

DoNascimiento, C.; Provenzano, F. & Lundberg, J.G. 2004. Rhamdia guasarensis (Siluriformes: Heptapteridae), a new species of cave catfish from the Sierra Perijá, northwestern Venezuela. Proceedings of the Biological Society of Washington, 117(4): 564-574.

Dubois, A. 2010. Zoological nomenclature in the century of extinctions: priority vs. usage. Organisms Diversity & Evolution, 10(3): 259-274.

Eigenmann, C.H. 1916. VI. New and rare fishes from South American rivers. Annals of the Carnegie Museum, 10(1-2): 77-86, pl. 13-16.

Eigenmann, C.H. 1919. Peces Colombianos de las cordilleras y de los llanos al oriente de Bogotá. Boletin de la Sociedad Colombiana de Ciencias Naturales, 7(62-65): 126-136.

Eigenmann, C.H. 1922. The fishes of western South America, Part I. The fresh-water fishes of northwestern South America, including Colombia, Panama, and the 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): 1-350, pl. 1-38.

Ferraris-Jr., C.J. & Mago-Leccia, F. 1989. A new genus and species of pimelodid catfish from the Río Negro and Río Orinoco drainages of Venezuela (Siluriformes: Pimelodidae). Copeia, 1989(1): 166-171.

Fisch-Muller, S.; Cardoso, A.R.; Silva, J.F.P. & Bertaco, V.A. 2005. Two new Amazonian species of armored catfishes (Siluriformes: Loricariidae): Ancistrus verecundus and Ancistrus parecis. Neotropical Ichthyology, 3(4): 525-532.

Fowler, H.W. 1945. Description of seven new fresh-water fishes from Peru. Notulae Naturae (Philadelphia), 159: 1-11.

Fricke, R.; Eschmeyer, W.N. & Fong, J.D. 2021. Species by family/subfamily. Available: Access: 02/05/2021.

Gosline, W.A. 1941. Synopsis of the genera of pimelodid catfishes without a free orbital rim. Stanford Ichthyological Bulletin, 2(3): 83-88.

Haseman, J.D. 1911. Descritions of some new species of fishes and miscellaneous notes on others obtained during the expedition of the Carnegie Museum to central South America. Annals of the Carnegie Museum, 7(3-4): 315-328, pl. 46-48 (fig. 1), 49-50 (fig. 1), 51-52.

Herrick, C.J. 1899. The cranial and first spinal nerves of Menidia. A contribution upon the nerve components of the bony fishes. Archives of Neurology and Psychopathology, 2: 1-299.

Herrick, C.J. 1901. The cranial nerves and cutaneous sense organs of the North American siluroid catfishes. Journal of Comparative Neurology, 11(3): 177-249.

Hoedeman, J.J. 1961. Notes on the ichthyology of Surinam and other Guianas. 8. Additional records of siluriforms fishes (2). Bulletin of Aquatic Biology, 2(23): 129-139.

IUCN Standards and Petitions Sub-Committee. 2019. Guidelines for using the IUCN Red List Categories and Criteria. Version 14. Prepared by the Standards and Petitions Sub-Committee. Available from: Access: 11/2019.

Lima, F.C.T.; Britski, H.A. & Machado, F.A. 2007. A new Moenkhausia (Characiformes: Characidae) from central Brazil, with comments on the area relationship between the upper rio Tapajós and upper rio Paraguai systems. Aqua, International Journal of Ichthyology, 13(2): 45-54.

Lundberg, J.G. & Baskin, J.N. 1969. The caudal skeleton of the catfishes, Order Siluriformes. American Museum Novitates, 2398: 1-49.

Lundberg, J.G. & McDade, L.A. 1986. On the South American catfish Brachyrhamdia imitator Myers (Siluriformes, Pimelodidae), with phylogenetic evidence for a large intrafamilial lineage. Notulae Naturae, 463: 1-24.

Lundberg, J.G.; Bornbusch, A.H. & Mago-Leccia, F. 1991. Gladioglanis conquistador n. sp., from Ecuador with diagnoses of the subfamilies Rhamdiinae Bleeker and Pseudopimelodinae n. subf. (Siluriformes, Pimelodidae). Copeia, 1991: 190-209.

Lundberg, J.G.; Luckenbill, K.R.; Subhash Babu, K.K. & Ng, H.H. 2014. A tomographic osteology of the taxonomically puzzling catfish Kryptoglanis shajii (Siluriformes, Siluroidei, incertae sedis): description and a first phylogenetic interpretation. Proceedings of the Academy of Natural Sciences of Philadelphia, 163(1): 1-41.

Miles, C.W. 1943. Estudio economico y ecologico de los peces de agua dulce del Valle del Cauca. Cali, Publicaciones de la Secretaria de Agricultura y Fomento del Departamento.

Miquelarena, A.M. & Menni, R.C. 1999. Rhamdella aymarae, a new species from the Itiyuro River, northern Argentina (Siluriformes: Pimelodidae). Ichthyological Exploration of Freshwaters, 10(3): 201-210.

Mojica, J.I.; Galvis, G.; Sánchez-Duarte, P.; Castellanos, C. & Villa-Navarro, F.A. 2006. Peces del valle medio del río Magdalena, Colombia. Biota Colombiana, 7(1): 23-28.

Ohara, W.M. & Lima, F.C.T. 2015. Hyphessobrycon lucenorum (Characiformes: Characidae), a new species from the rio Madeira basin, Rondônia State, Brazil. Zootaxa, 3972(4): 562-572.

Ohara, W.M. & Loeb, M.V. 2016. Ichthyofauna of the upper Juruena river on Chapada dos Parecis, Mato Grosso, Brazil. Biota Neotropica, 16(4): 1-10.

Ohara, W.M. & Marinho, M.M.F. 2016. A new species of Moenkhausia Eigenmann (Characiformes: Characidae) from the upper rio Machado at Chapada dos Parecis, rio Madeira basin, Brazil. Neotropical Ichthyology, 14(1): e150041 [37-44].

Ohara, W.M.; Lima, F.C.T. & Barros, B.S. 2017. Hyphessobrycon petricolus, a new species of tetra (Characiformes: Characidae) from the rio Madeira basin, Mato Grosso, Brazil. Zootaxa, 4221(2): 242-250.

Ohara, W.M.; Tencatt, L.F.C. & Britto, M.R. 2016. Wrapped in flames: Corydoras hephaestus, a new remarkably colored species from the Rio Madeira basin (Teleostei: Callichthyidae). Zootaxa, 4170(3): 539-552.

Ortega-Lara, A. 2004. Los peces del Alto Cauca: caracterización de la ictiofauna nativa de los principales ríos de la cuenca alta del río Cauca en el departamento del Cauca. Catálogo de especies. Popayán, Corporación Autónoma Regional del Cauca – CRC.

Ortega-Lara, A. 2012. Redescripción de Cetopsorhamdia nasus Eigenmann y Fisher, 1916 (Siluriformes: Heptapteridae. Biota Colombiana, 13(1): 47-70.

Ortega-Lara, A.; Milani, N.; DoNascimiento, C.; Villa-Navarro, F. & Maldonado-Ocampo, J.A. 2011. Two new trans-Andean species of Imparfinis Eigenmann & Norris (Siluriformes: Heptapteridae) from Colombia. Neotropical Ichthyology, 9(4): 777-793.

Ortega-Lara, A.; Usma, J.S.; Bonilla, P.A. & Santos, N.L. 2006. Peces de la cuenca alta del río Cauca, Colombia. Biota Colombiana, 7(1): 39-54.

Pastana, M.; Bockmann, F.A. & Datovo, A. 2020. The cephalic laterosensory system of Characiformes (Teleostei; Ostariophysi): anatomy and phylogenetic implications. Zoological Journal of the Linnean Society, 189(1): 1-46.

Raposo, M.A.; Kirwan, G.M.; Calijorne Lourenço, A.C.; Sobral, G.; Bockmann, F.A. & Stopiglia, R. 2020. On the notions of taxonomic ‘impediment’, ‘gap’, ‘inflation’ and ‘anarchy’, and their effects on the field of conservation. Systematics & Biodiversity.

Reis, R.E. 2005. Catfishland, or the Brazilian leg of the Trans-Continental Catfish Expedition sponsored by the All Catfish Species Inventory. In: Joint Meeting of Ichthyologists and Herpetologists, Abstract Book, Tampa, Florida, 2005, 6-11, July. Tampa, American Elasmobranch Society, American Socitey of Ichthyologists and Herpetologists, Herpetologists’ League, Society for Study of Amphibians and Reptiles, p. 430.

Ruiz-C., R.I. & Román-Valencia, C. 2006. Aspectos taxonómicos de Cetopsorhamdia boquillae y C. nasus (Pisces, Heptapteridae), con anotaciones sobre su ecología en la cuenca alta de los ríos Magdalena y Cauca, Colombia. Animal Biodiversity and Conservation, 29(2): 123-131.

Schubart, O. & Gomes, A.L. 1959. Descrição de Cetopsorhamdia iheringi sp. n. (Pisces, Nematognathi, Pimelodidae, Luciopimelodinae). Revista Brasileira de Biologia, 19(1): 1-7.

Schultz, L.P. 1944. The catfishes of Venezuela, with description of thirty-eight new forms. Proceedings of the United States National Museum, 94 (3172): 173-338.

Silfvergrip, A.M.C. 1996. A systematic revision of the neotropical catfish genus Rhamdia. Stockholm, Swedish Museum of Natural History.

Silva, G.S.C.; Roxo, F.F.; Melo, B.F.; Ochoa, L.E.; Bockmann, F.A.; Sabaj, M.H.; Jerep, F.C.; Foresti, F.; Benine, R.C. & Oliveira, C. 2021. Evolutionary history of Heptapteridae catfishes using ultraconserved elements (Teleostei, Siluriformes). Zoologica Scripta.

Slobodian, V. & Bockmann, F.A. 2013. A new Brachyrhamdia (Siluriformes: Heptapteridae) from Rio Japurá basin, Brazil, with comments on its phylogenetic affinities, biogeography and mimicry in the genus. Zootaxa, 3717(1): 1-22.

Slobodian, V. & Pastana, M. 2018. Description of a new Pimelodella (Siluriformes: Heptapteridae) species with a discussion on the upper pectoral girdle homology of Siluriformes. Journal of Fish Biology, 93(5): 901-916.

Steindachner, F. 1915. Beiträge zur Kenntnis der Flussfische Südamerikas V. Denkschriften der kaiserlichen Akademie der Wissenschaften, mathematisch-naturwissenschaftliche Klasse, 93: 15-106, pls. 1-13.

Stewart, D.J. 1985. A new species of Cetopsorhamdia (Pisces: Pimelodidae) from the Río Napo basin of eastern Ecuador. Copeia, 1985(2): 339-344.

Sullivan, J.P.; Muriel-Cunha, J. & Lundberg, J.G. 2013. Phylogenetic relationships and molecular dating of the major groups of catfishes of the Neotropical superfamily Pimelodoidea (Teleostei, Siluriformes). Proceedings of the Academy of Natural Sciences of Philadelphia, 162(1): 89-110.

Taylor, W.R. & Van Dyke, G.C. 1985. Revised procedures for staining and clearing small fishes and other vertebrates for bone and cartilage study. Cybium, 9(2): 107-119.

Villa-Navarro, F.A.; Zúñiga-Upegui, P.T.; Castro-Roa, D.; García-Melo, J.E.; García-Melo, L.J. & Herrada-Yara, M.E. 2006. Peces del alto Magdalena, cuenca del río Magdalena, Colombia. Biota Colombiana, 7(1): 3-22.

Wingert, J.M. & Malabarba, L.R. 2011. A new species of Bryconops (Teleostei: Characidae) from the rio Madeira basin, Northern Brazil. Neotropical Ichthyology, 9(3): 471-476.

Zawadzki, C.H.; Bifi, A.G. & Mariotto, S. 2016. Araichthys loro, a new genus and species of suckermouth armored catfish from the upper rio Tapajós basin, Brazil (Siluriformes: Loricariidae). Ichthyological Exploration of Freshwaters, 27(4): 361-372.

Zuanon, J.A.S.; Bockmann, F.A. & Sazima, I. 2006. A remarkable sand-dwelling fish assemblage from central Amazonia, with comments on the evolution of psammophily in South American freshwater fishes. Neotropical Ichthyology, 4(1): 107-118.




How to Cite

Bockmann, F. A., & Reis, R. E. (2021). Two new, remarkably colored species of the Neotropical catfish genus Cetopsorhamdia Eigenmann & Fisher, 1916 (Siluriformes, Heptapteridae) from Chapada dos Parecis, western Brazil, with an assessment of the morphological characters bearing on their phylogenetic relationships. Papéis Avulsos De Zoologia, 61, e20216156.



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