Abstract
Imparfinis comprises 20 valid species in the Heptapteridae, being the most diverse taxonomic group of catfishes of the Nemuroglanis subclade. The genus has one of the widest geographical distributions in the neotropical region, found on both sides of the Andes, from Costa Rica to the Paraná and Uruguay river basins in Argentina. A new species of Imparfinis is described from streams of the upper Rio Tapajós and its tributary Teles Pires in northern Brazil. The new species is diagnosed from all congeners by the presence of a vertical dark brown band W-shaped at the base of the caudal-fin rays, a thick dark brown lateral stripe from the snout to the end of the caudal peduncle, dark brown head, long maxillary barbel surpassing the distal margin of the pectoral fin, and presence of 39 or 40 total vertebrae.
References
Bockmann, F.A. (1994) Description of Mastiglanis asopos, a new pimelodid catfish from northern Brazil, with comments on phylogenetic relationships inside the subfamily Rhamdiinae (Siluriformes, Pimelodidae). Proceedings of the Biological Society of Washington, 107, 760–777.
Bockmann, F.A. (1998) Análise filogenética da família Heptapteridae (Teleostei, Ostariophysi, Siluriformes) e redefinição de seus gêneros. Doctoral dissertation, D. Sc. thesis, Universidade de São Paulo, São Paulo, 599 pp.
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. & 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 & Eigenmann, 1888 (Siluriformes, Heptapteridae). Zootaxa, 1780, 1–54.
https://doi.org/10.11646/zootaxa.1780.1.1
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.
Bockmann, F.A. & Slobodian, V. (2018) Family Heptapteridae. In: Van der Sleen, P. & Albert, J. (Eds.) Field Guide to the Fishes of the Amazon, Orinoco, and Guianas. Princeton University Press, Princeton and Oxford, pp. 233–252.
Burgess, W.E. (1989) An atlas of freshwater and marine catfishes. A preliminary survey of the Siluriformes. Illustrated Edition. TFH Publications, Neptune, 784 pp.
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, 163–80.
https://doi.org/10.1635/0097-3157(2008)157[163:TVSOPS]2.0.CO;2
Eigenmann, C.H. & Norris, A.A. (1900) Sobre alguns peixes de S. Paulo, Brazil. Revista do Museu Paulista, 4, 349–362.
Fricke, R., Eschmeyer, W.N. & Van der Laan, R. (Eds.) (2019) Catalog of Fishes: Genera, Species, References. Available from: http://researcharchive.calacademy.org/research/ichthyology/catalog/fishcatmain.asp (accessed 29 October 2019)
Gosline, W.A. (1941) Synopsis of the genera of pimelodid catfishes without a free orbital rim. Stanford Ichthyological Bulletin, 2, 83–88.
IUCN Standards and Petitions Subcommittee (2019) Guidelines for Using the IUCN Red List Categories and Criteria. Version 14. Available from: http://www.iucnredlist.org/documents/RedListGuidelines.pdf (accessed 29 October 2019)
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 a phylogenetic evidence for a large intrafamilial lineage. Notulae Naturae, Philadelphia, 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 (1), 190–209.
https://doi.org/10.2307/1446263
Mees, G.F. (1974) The Auchenipteridae and Pimelodidae of Suriname (Pisces, Nematognathi). Zoologische Verhandelingen, 132, 1–256.
Mees, G.F. & Cala, P. (1989) Two new species of Imparfinis from northern South America (Pisces, Nematognathi, Pimelodidae). Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen, Series C, 92, 379–394.
Ohara, W.M., Lima, F.C.T., Salvador, G.N. & Andrade, M.C. (2017) Peixes do rio Teles Pires: diversidade e guia de identificação. 1ª edição. Gráfica e Editora Amazonas, Goiânia, 408 pp.
Ortega-Lara, A., Milani, N., DoNascimiento, C., Villa-Navarro, F. & Maldonado-Ocampo, J.A. (2011) Two new trans-Andean species of Imparfinis Eigenmann & Norris, 1900 (Siluriformes: Heptapteridae) from Colombia. Neotropical Ichthyology, 9 (4), 777–793.
https://doi.org/10.1590/S1679-62252011000400009
Pearson, N.E. (1924) The fishes of the eastern slope of the Andes. I. The fishes of the Rio Beni basin, Bolivia, collected by the Mulford expedition. Indiana University Studies, 64 (11), 1–83.
Sabaj, M.H. (2019) Standard symbolic codes for institutional resource collections in herpetology and ichthyology: An Online Reference. Version 7.1 (21 March 2019). American Society of Ichthyologists and Herpetologists, Washington, D.C., 120 pp. Available from: https://asih.org/sites/default/files/2019-04/Sabaj_2019_ASIH_Symbolic_Codes_v7.1.pdf (acessed 29 October 2019)
Steindachner, F. (1915) Beiträge zur Kenntniss der Flußfische Südamerikas. V. Denkschriften der Kaiserlichen Akademie der Wissenschaften in Wien, Mathematisch-Naturwissenschaftliche Klasse, 93, 15–106.
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.