Abstract
We described herein a new Hemigrammus from the río Madre de Dios and rio Mamoré basins in southeastern Peru and Bolivia. The new species possess a color pattern similar to those belonging to the Hemigrammus lunatus species-group, i.e., a broad longitudinal dark stripe across the eye and a conspicuous, narrow dark stripe along the anal-fin basis. It can be easily diagnosed from the species belonging to this group by presenting the combination of the following characters: an oval, horizontally elongated humeral blotch, 6-7 upper branch and 10-12 lower branch gill-rakers, up to five cusps on broader maxillary teeth, and by lacking a midlateral dark stripe. Comments on its putative relationships are provided. Additionally, we updated the geographical distribution of Hemigrammus lunatus and H. machadoi based on an exhaustive survey of material deposited in collections. [Species Zoobank registration: urn:lsid:zoobank.org:act:A2ED5D61-8434-4A0F-BC5B-B496FB3DC191]
References
Abell, R., Thieme, M.L., Revenga, C., Bryer, M., Kottelat, M., Bogutskaya, N., Coad, B., Mandrak, N., Balderas, S.C., Bussing, W., Stiassny, M.L.J., Skelton, P., Allen, G.R., Unmack, P., Naseka, A., Ng, R., Sindorf, N., Robertson, J., Armijo, E., Higgins, J.V., Heibel, T.J., Wikramanayake, E., Olson, D., López, H.L., Reis, R.E., Lundberg, J.G., Sabaj, M.H.P. & Petry, P. (2008) Freshwater ecoregions of the world: a new map of biogeographic units for freshwater biodiversity conservation. BioScience, 58, 403–414.
https://doi.org/10.1641/B580507
Britzke, R., Troy, W.P., Oliveira, C. & Benine, R.C. (2018) Description of a new species of Moenkhausia (Characiformes: Characidae) from the upper Paraguay basin, Central Brazil, with comments on its phylogenetic relationships. Neotropical Ichthyology, 16 (2), e170086.
https://doi.org/10.1590/1982-0224-20170086
Eigenmann, C.H. (1918) The American Characidae—II. Memoirs of Museum of Comparative Zoology, 43, 103–208, pls. 9–11 + 13 + 17–29 + 33 + 78–80 + 93.
Fink, W.L. & Weitzman, S.H. (1974) The so-called Cheirodontin fishes of Central America with descriptions of two new species (Pisces: Characidae). Smithsonian Contributions to Zoology, 172, 1–46.
https://doi.org/10.1590/1982-0224-20150052
Galacatos, K., Barriga-Salazar, R. & Stewart, D.J. (2004) Seasonal and habitat influences on fish communities within the lower Yasuni River basin of Ecuadorian Amazon. Environmental Biology of Fishes, 71, 33–51.
https://doi.org/10.1023/B:EBFI.0000043156.69324.94
Galacatos, K., Stewart, D.J. & Ibarra, M. (1996) Fish community patterns of lagoons and associated tributaries in the Ecuadorian Amazon. Copeia, 1996 (4), 875–894.
https://doi.org/10.2307/1447650
Ibarra, M. & Stewart, D.J. (1989) Longitudinal zonation of sandy beach fishes in the Napo River basin, eastern Ecuador. Copeia, 1989 (2), 364–381.
https://doi.org/10.2307/1445433
Lasso, C.A., Mojica, J.I., Usma, S., Maldonado-Ocampo, J.A., DoNascimiento, C., Taphorn, D.C., Provenzano, F., Lasso-Alaclá, O.M., Galvis, G., Vásquez, L., Lugo, M., Machado-Allison, A., Royero, R., Suárez, C. & Ortega-Lara, A. (2004) Peces de la cuenca del rio Orinoco. Parte I: lista de espécies y distribucion por subcuencas. Biota Colombiana, 5, 95–158.
Lima, F.C.T., Correa, V. & Ota, R.P. (2016) A new species of Hemigrammus Gill 1858 (Characiformes: Characidae) from the western Amazon basin in Peru and Colombia. Aqua, International Journal of Ichthyology, 22 (3), 123–132.
Lima, F.C.T. & Sousa, L.M. (2009) A new species of Hemigrammus from the upper rio Negro basin, Brazil, with comments on the presence and arrangement of anal-fin hooks in Hemigrammus and related genera (Ostariophysi: Characiformes: Characidae). Aqua, International Journal of Ichthyology, 15, 153–168.
Javonillo, R., Malabarba, L.R., Weitzman, S.H. & Burns, J.R. (2010) Relationships among major lineages of characid fishes (Teleostei: Ostariophysi: Characiformes), based on molecular sequence data. Molecular Phylogenetics and Evolution, 54 (2), 498–511.
https://doi.org/10.1016/j.ympev.2009.08.026
Lima, F.C.T. & Ribeiro, A.C. (2011) Continental-scale tectonic controls of biogeography and ecology. In: Albert, J.S. & Reis, R.E. (Eds.), Historical Biogeography of Neotropical Freshwater Fishes. University of California Press, Berkeley, pp. 145–164.
https://doi.org/10.1525/california/9780520268685.003.0009
Menezes, N.A. & Weitzman, S.H. (1990) Two new species of Mimagoniates (Teleostei: Characidae: Glandulocaudinae), their phylogeny and biogeography and a key to the glandulocaudin fishes of Brazil and Paraguay. Proceedings of the Biological Society of Washington, 103, 380–426.
Mirande, J.M. (2010) Phylogeny of the family Characidae (Teleostei: Characiformes): from characters to taxonomy. Neotropical Ichthyology, 8, 385–568.
https://doi.org/10.1590/S1679-62252010000300001
Mirande, J.M. (2018) Morphology, molecules and the phylogeny of Characidae (Teleostei, Characiformes). Cladistics, 1–19.
https://doi.org/10.1111/cla.12345
Mol, J.H.A. (2012) The freshwater fishes of Suriname. Koninklijke Brill, NV, Leiden, 890 pp.
Oliveira, C., Avelino, G.S., Abe, K.T., Mariguela, T.C., Benine, R.C., Ort, G., Vari, R.P. & Castro, R.M.C. (2011) Phylogenetic relationships within the speciose family Characidae (Teleostei: Ostariophysi: Characiformes) based on multilocus analysis and extensive ingroup sampling. BMC Evolutionary Biology, 11 (275), 1–25.
https://doi.org/10.1186/1471-2148-11-275Ota, R.P., Lima, F.C.T. & Pavanelli, C.S. (2014) A new species of Hemigrammus Gill, 1858 (Characiformes: Characidae) from the rio Madeira and rio Paraguai basins, with a redescription of H. lunatus. Neotropical Ichthyology, 12 (2), 265–279. https://doi.org/10.1590/1982-0224-20130176
Reia, L. & Benine, R.C. (2019) A new species of Hemigrammus Gill 1858 (Characiformes: Characidae) from the upper Rio Negro, Amazon basin, Brazil. Zootaxa, 4555 (3), 407–415.
https://doi.org/10.11646/zootaxa.4555.3.9
Sabaj, M.H. (2016) Standard symbolic codes for institutional resource collections in herpetology and ichthyology: an online reference. Version 6.5 (16 August 2016). American Society of Ichthyologists and Herpetologists, Washington, D.C. Electronically accessible. Available from: http://www.asih.org (accessed 26 February 2019)
Soares, I.M. & Bührnheim, C.M. (2016) A new species of Moenkhausia Eigenmann, 1903 (Characiformes: Characidae) from Amazon basin, Brazil. Zootaxa, 4208 (4), 392–400.
https://doi.org/10.11646/zootaxa.4208.4.6
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, 107–109.
Weitzman, S.H. & Fink, W.L. (1983) Relationships of the neon tetras, a group of South American freshwater fishes (Teleostei, Characidae), with comments on the phylogeny of New World characiforms. Bulletin of the Museum of Comparative Zoology, 150, 339–395.