Abstract
A new species of Pimelodella is described from western Andean tributaries of the Orinoco River basin. The new species differs from all congeners by a unique set of characters that includes long maxillary barbel, surpassing the dorsal lobe of the caudal fin; relatively short adipose fin (32.8–36.4 of SL); 40–42 total vertebrae; posterior margin of pectoral-fin spine with 12–18 retrorse dentations along basal two thirds; laterosensory canal foramina of dentary and preopercle large and externally conspicuous; a brown faint and narrow midlateral stripe extending from the pseudotympanum, fading posteriorly along the caudal peduncle, and ending as a spot at the caudal-fin base; and dorsal-fin base darkly pigmented, from spinelet to posteriormost interradial membrane. Taxonomic status of P. pallida and presence of P. cruxenti in Colombia are also discussed.
References
Bockmann, F.A. (1998) Análise filogenética da família Heptapteridae (Teleostei: Ostariophysi: Siluriformes) e redefinição de seus gêneros. Unpublished Doctoral Thesis. Universidade de São Paulo, São Paulo, 559 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, 673–706.
https://doi.org/10.1590/S1679-62252010000400001
Bockmann, F.A. & Guazzelli, G.M. (2003) Heptapteridae (Heptapterids). In: Reis, R. E., Kullander, S.O. & Ferraris, C.J. Jr. (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.
https://doi.org/10.11646/zootaxa.1780.1.1
Cala, P. (1981) Catálogo de los especimenes tipo en la colección de peces del Instituto de Ciencias Naturales, Museo de Historia Natural de la Universidad Nacional de Colombia. Lozania. Acta Zoologica Colombiana, 34, 1–5.
Conde-Saldaña, C.C., Albornoz-Garzón, J.G., García-Melo, J.E., Dergam, J.A. & Villa-Navarro, F.A. (2019) A new species of Pimelodella Eigenmann & Eigenmann, 1888 (Siluriformes: Heptapteridae) from the Sierra Nevada de Santa Marta, Colombia. Zootaxa, 4668 (4), 562–574.
https://doi.org/10.11646/zootaxa.4668.4.8
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.
https://doi.org/10.1206/0003-0090.431.1.1
Dahl, G. (1961) Nematognathous fishes collected during the Macarena Expedition 1959. Part II: Pimelodidae, Callophysidae. Novedades Colombianas, 1, 483–514.
DoNascimiento, C., Mesa S., L.M., Albornoz-Garzón, J.G., Méndez-López, A., Lasso, C.A., García-Melo, J.E., Sabaj, M.H. & Morales-Betancourt, M.A. (2018) Peces de los ríos Guayabero medio, bajo Losada y bajo Duda, sierra de La Macarena, Meta, Colombia. In: Lasso, C.A., Morales-Betancourt, M.A. & Escobar-Martínez, I.D. (Eds.), V. Biodiversidad de la sierra de La Macarena, Meta, Colombia. Parte I. Ríos Guayabero medio, bajo Losada y bajo Duda. Serie Editorial Fauna Silvestre Neotropical, Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, Bogotá, D.C., pp. 121–177.
https://doi.org/10.21068/a2018n02
DoNascimiento, C., Herrera-Collazos, E.E. & Maldonado-Ocampo J.A. (2019) Listas de especies de peces de agua dulce de Colombia/ Checklist of the freshwater fishes of Colombia. Version 2.11. Asociación Colombiana de Ictiólogos, Medellín. [dataset/checklist]
https://doi.org/10.15472/numrso
Eigenmann, C. H. (1917) Pimelodella and Typhlobagrus. Memoirs of the Carnegie Museum, 7, 229–258, pls. 29–35.
Eigenmann, C.H. & Eigenmann, R.S. (1888) Preliminary notes on South American Nematognathi. I. Proceedings of the California Academy of Sciences, Series 2, 1, 119–172.
https://doi.org/10.5962/bhl.part.3477
Fernández-Yépez, A. (1950) Algunos peces del río Autana. Novedades Científicas, Contribuciones Ocasionales del Museo de Historia Natural La Salle, Serie Zoológica, 2, 1–18, Pls. 1–3.
Fowler, H.W. (1940) Zoological results of the second Bolivian expedition for the Academy of Natural Sciences of Philadelphia, 1936–1937. Part I.—The fishes. Proceedings of the Academy of Natural Sciences of Philadelphia, 92, 43–103.
Fricke, R., Eschmeyer, W.N. & Van der Laan, R. (2020) Eschmeyer’s Catalog of fishes: genera, species, references. Available from: http://researcharchive.calacademy.org/research/ichthyology/catalog/fishcatmain.asp (accessed 8 June 2020)
Galán, C. & Herrera, F.F. (2017) Ríos subterráneos y acuíferos kársticos de Venezuela: Inventario, situación y conservación. In: Rodríguez-Olarte, D. (Ed.), Ríos en riesgo en Venezuela. 1. Colección Recursos Hidrológicos de Venezuela. Universidad Centroccidental Lisandro Alvarado, Barquisimeto, pp. 153–171.
Lundberg, J.G. & Baskin, J.N. (1969) The caudal skeleton of the catfishes, order Siluriformes. American Museum Novitates, 2398, 1–49.
Mojica, J.I. & Agudelo-Zamora, H.D. (2018) Historical review, catalog of type specimens and online database of the ichthyology collection of the Instituto de Ciencias Naturales of the Universidad Nacional de Colombia (ICN-MHN). Zootaxa, 4478 (1), 1–79.
https://doi.org/10.11646/zootaxa.4478.1.1
Morris, P. J., Yager, H.M. & Sabaj Pérez, M.H. (2006) ACSImagebase: a digital archive of catfish images compiled by participants in the All Catfish Species Inventory. WWW image Database. Available from: http://acsi.acnatsci.org/base (accessed 18 June 2020)
Sabaj, M.H. (2019) Standard symbolic codes for institutional resource collections in herpetology and ichthyology: an online reference. Version 7.1. American Society of Ichthyologists and Herpetologists. Available from: http://www.asih.org/ (accessed 19 April 2019)
Schultz, L.P. (1944) The catfishes of Venezuela, with descriptions of thirty-eight new forms. Proceedings of the United States National Museum, 94, 173–338, pls. 1–14.]
https://doi.org/10.5479/si.00963801.94-3172.173
Slobodian, V. & Pastana, M.N.L. (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, 901–916.
https://doi.org/10.1111/jfb.13795
Slobodian, V., Akama, A. & Dutra, G.M. (2017) A new species of Pimelodella (Siluriformes: Heptapteridae) from the Guiana Shield, Brazil. Zootaxa, 4338 (1), 85–100.
https://doi.org/10.11646/zootaxa.4338.1.4
Springer, V.G. & Johnson, G.D. (2000) Use and advantages of ethanol solution of Alizarin Red S dye for staining bone in fishes. Copeia, 2000, 300–301.
https://doi.org/10.1643/0045-8511(2000)2000[0300:UAAOES]2.0.CO;2
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.
Trajano, E., Reis, R.E. & Bichuette, M.E. (2004) Pimelodella spelaea: a new cave catfish from central Brazil, with data on ecology and evolutionary considerations (Siluriformes: Heptapteridae). Copeia, 2004, 315–325.
https://doi.org/10.1643/CI-03-144R1
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, 177–212.