Abstract
A new species of Pimelodella is described from the Rio Ipitinga, Rio Jari basin, a left bank tributary of the Rio Amazonas in Brazil. The new species is diagnosed from all congeners by having a dark oval mark on the humeral region. It also differs from all congeners by a unique set of characters, including the presence of 47 to 49 total vertebrae, unpigmented areas dorsally and ventrally adjacent to the dark midlateral stripe, and maxillary barbels reaching at least to vertical through caudal fin insertion. Faunal similarities between the southern part of the eastern Guiana Shield and coastal drainages in the Guianas and Suriname are discussed.
References
Ahl, E. (1925) Neue südamerikanische Fische aus dem Zool. Museum Berlin. Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin, 1923, 106–109. [in German]
Aleixo, A., Montag, L.F.A., Wosiacki, W.B., Silva, F.R., Freitas, T.M.S., Peixoto, L.A.W., Araújo, A.B., Avila-Pires, T.C., Hoogmoed, M.S., Rocha, W.A., Poletto, F., Lima, M.F.C., Silva, M.C., Rossi, R.V., Miranda, C.L., Fonseca, R.T.D., Silva, M.R.P., Souza, M.G.C., Coelho, R.F.R. & Carmo, A. (2011) Diagnóstico da Biodiversidade das Unidades de Conservação Estaduais do Mosaico Calha Norte, estado do Pará – Reserva Biológica Maicuru. In: Secretaria de Estado de Meio Ambiente, Plano de manejo da Reserva Biológica Maicuru: Anexos, Secretaria de Estado de Meio Ambiente, Belém, pp. 5–71.
Birindelli, J.L.O., Peixoto, L.A.W., Wosiacki, W.B. & Britski, H.A. (2013) New Species of Hypomasticus Borodin, 1929 (Characiformes: Anostomidae) from Tributaries of the Lower Rio Amazonas, Brazil. Copeia, 2013, 464–469.
https://doi.org/10.1643/CI-12-148
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.
https://doi.org/10.1590/S1679-62252010000400001
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. Edipucrs, Porto Alegre, pp. 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. & 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. Vol. 3. Dialeto, São Paulo, pp. 12–71. [in Portuguese]
Boulenger, G.A. (1887) An account of the fishes collected by Mr. C. Buckley in eastern Ecuador. Proceedings of the Zoological Society of London, 1887 (2), 274–283.
https://doi.org/10.1111/j.1096-3642.1887.tb02962.x
Cope, E.D. (1878) Synopsis of the fishes of the Peruvian Amazon, obtained by Professor Orton during his expeditions of 1873 and 1877. Proceedings of the American Philosophical Society, 17 (101), 673–701.
Eigenmann, C.H. (1912) The freshwater fishes of British Guiana, including a study of the ecological grouping of species, and the relation of the fauna of the plateau to that of the lowlands. Memoirs of the Carnegie Museum, 5 (1), 1–578.
https://doi.org/10.5962/bhl.part.14515
Eigenmann, C.H. (1917) Pimelodella and Typhlobagrus. Memoirs of the Carnegie Museum, 7, 229–258.
Eschmeyer, W.N. & Fong, J.D. (2017) Species by Family/Subfamily. Available from: http://researcharchive.calacademy.org/research/ichthyology/catalog/SpeciesByFamily.asp (accessed 3 May 2017)
Eschmeyer, W.N., Fricke, R. & van der Laan, R. (Eds.) (2017) Catalog of Fishes: Genera, Species, References. Available from: http://researcharchive.calacademy.org/research/ichthyology/catalog/fishcatmain.asp (accessed 3 May 2017)
Ferraris Jr., C.J. (2007) Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types. Zootaxa, 1418 (1), 1–628.
https://doi.org/10.11646/zootaxa.1418.1.1Fowler, H.W. (1914) Fishes from the Rupununi River, British Guiana. Proceedings of the Academy of Natural Sciences of Philadelphia, 66, 229–284.
Fowler, H.W. (1941) A collection of fresh-water fishes obtained in eastern Brazil by Dr. Rodolpho von Ihering. Proceedings of the Academy of Natural Sciences of Philadelphia, 93, 123–336.
Guazzelli, G.M. (1997) Revisão das Espécies de Pimelodella Eigenmann & Eigenmann, 1888 (Teleostei: Siluriformes: Pimelodidae) dos Sistemas Costeiros do Sul e Sudeste Brasileiro. Unpublished Master Dissertation, Pontifíca Universidade Católica do Rio Grande do Sul, Porto Alegre, 150 pp. [in Portuguese]
Hoedeman, J.J. (1961) Notes on the ichthyology of Surinam and other Guianas, 8, Additional records of siluriform fishes, 2. Bulletin of Aquatic Biology, 2 (23), 129–139.
Kner, R. (1858) Ichthyologische Beiträge. II, Abtheilung, Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften, Mathematisch-Naturwissenschaftliche Classe, 26 (373), 373–448. [in German]
Lehmann, P., Lazzarotto, H. & Reis, R.E. (2014) Parotocinclus halbothi, a new species of small armored catfish (Loricariidae: Hypoptopomatinae), from the Trombetas and Marowijne River basins, in Brazil and Suriname. Neotropical Ichthyology, 12, 27–33.
https://doi.org/10.1590/S1679-62252014000100002
Lundberg, J.G. & Baskin, J.N. (1969) The caudal skeleton of the catfishes, order Siluriformes. American Museum Novitates, 2398, 1–49.
Mees, G.F. (1983) Naked catfishes from French Guiana (Pisces, Nematognathi). Zoologische Mededelingen (Leiden), 57, 43–58.
Miranda Ribeiro, A. (1907) Uma novidade ichthyologica. Kosmos, 4 (1), 3 unnumbered pages. [in Portuguese]
Miranda Ribeiro, A. (1914) Pimelodidae, Trachycorystidae, Cetopsidae, Bunocephalidae, Auchenipteridae, e Hypophthalmidae. In: Commissào de Linhas Telegraphicas Estrategicas de Matto-Grosso ao Amazonas, Annexo No. 5 (História Natural: Zoologia, pp. 1–13. [in Portuguese]
Müller, J. & Troschel, F.H. (1849) Fische. In: Reisen in Britisch-Guiana in den Jahren 1840-44, Im Auftrag Sr. Mäjestat des Königs von Preussen ausgeführt von Richard Schomburgk, 3, pp. 618–644. [in German]
Sabaj, M.H. (2016) Standard symbolic codes for institutional resource collections in herpetology and ichthyology: an online reference, Version 6.5, American Society of Ichthyologists and Herpetologists. Available from: http://www.asih.org/ (accessed 3 May 2017)
Sabaj, M.H. & Arce, M. (2017) Taxonomic assessment of the Hard-Nosed Thornycats (Siluriformes: Doradidae: Trachydoras Eigenmann 1925) with description of Trachydoras gepharti, n. sp. Proceedings of the Academy of Natural Sciences of Philadelphia, 166 (1), 1–53.
https://doi.org/10.1635/053.166.0102
Slobodian, V. (2013) Taxonomia, Sistemática e Biogeografia de Brachyrhamdia Myers, 1927 (Siluriformes: Heptapteridae), com uma investigação sobre seu mimetismo com outros Siluriformes. Unpublished Master Dissertation, Universidade de São Paulo, Ribeirão Preto, 316 pp. [in Portuguese]
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.
https://doi.org/10.11646/zootaxa.3717.1.1
Souza-Shibatta, L., Pezenti, L.F., Ferreira, D.G., Almeida, F.S.D., Sofia, S.H. & Shibatta, O.A. (2013) Cryptic species of the genus Pimelodella (Siluriformes: Heptapteridae) from the Miranda River, Paraguay River basin, Pantanal of Mato Grosso do Sul, Central Brazil. Neotropical Ichthyology, 11 (1), 101–109.
https://doi.org/10.1590/S1679-62252013000100012
Steindachner, F. (1877) Die Süsswasserfische des südöstlichen Brasilien, III. Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften, Mathematisch-Naturwissenschaftliche Classe, Wien, Abt.1 Botanik, Zoologie, Anatomie, Geologie und Paläontologie, 74, 559–694, pls. 1–13. [in German]
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, 107–119.
Valenciennes, A. (1835) Poissons [plates]. In: d'Orbigny, A. (Ed.), Voyage dans l'Amérique méridionale (le Brésil, la République Orientale de l’Uruguay, la République Argentine, la Patagonie, la République du Chili, la République de Bolivia, la République du Pérou), Exécuté Pendant les Années 1826, 1827, 1828, 1829, 1830, 1832 et 1833. Vol. 5. Part 2. Bertrand et Levrault, Paris, pls. 1–3.
Vanscoy, T., Lundberg, J.G. & Luckenbill, K. (2015) Bony ornamentation of the catfish pectoral-fin spine: comparative and developmental anatomy, with an example of fin-spine diversity using the Tribe Brachyplatystomini (Siluriformes, Pimelodidae). Proceedings of the Academy of Natural Sciences of Philadelphia, 164 (1), 177–212.
https://doi.org/10.1635/053.164.0107
Vari, R.P., Ferraris Jr., C.J., Radosavljevic, A. & Funk, V.A. (2009) Checklist of the freshwater fishes of the Guiana Shield. Bulletin of the Biological Society of Washington, 17, 1–93.
https://doi.org/10.2988/0097-0298-17.1.i
Wosiacki, W.B. & Miranda, D.P.S. (2013) Description of a new small species of the genus Cyphocharax (Characiformes: Curimatidae) from the Lower Amazon Basin. Copeia, 13, 627–633.
https://doi.org/10.1643/CI-12-127
Wosiacki, W.B., Coutinho, D.P. & Montag, L.F.A. (2011) Description of a new species of sand-dwelling catfish of the genus Stenolicmus (Siluriformes; Trichomycteridae). Zootaxa, 2752, 62–68.