A new Moenkhausia (Actinopterygii: Characiformes: Characidae) from the upper rio Negro basin, Brazil

Abstract

A new species of Moenkhausia is described from the upper rio Negro basin, Amazonas, Brazil. The new species is distinguished from all congeners, except M. agnesae, by presenting a color pattern characterized by the presence of two irregularly-shaped humeral blotches, and the presence of dark longitudinal stripes on the dorsal portion of the body. The new species can be readily separated from M. agnesae by presenting longitudinal stripes straight and more conspicuous dorsally, humeral blotches contacting each other, 2–3 tricuspid maxillary teeth, 32–35 lateral-line scales, and length of maxilla 45.3–51.0% in head length.

Checklist of the ichthyofauna of the Rio Negro basin in the Brazilian Amazon

“…Additionally, the fish diversity in hard-to-reach areas in the basin should be better sampled. Studies in the upper Rio Negro (Lima et al 2005) revealed the presence of taxa that had never been found in Rio Negro (i.e., representatives of Tometes and Utiaritichthys ; Serrasalmidae) and the discovery of at least 30 possible new species, several of which were eventually described (Britto and Lima 2003; Zanata and Lima 2005; Ferreira and Lima 2006; Lima et al 2009; Marinho and Lima 2009; Lima and Sousa 2009; Lima and Soares 2018; Lehmann et al 2018). Research should be encouraged in the regions of the upper and middle Rio Negro, particularly in the smaller tributaries near the borders between Brazil, Venezuela and Colombia.…”

Moenkhausia hemigrammoides Géry, 1965 (Characidae, Stethaprioninae) in Colombia: new records and comments on morphology

“…All fishes collected were fixed in 10% formaldehyde, preserved in 70% ethanol, and deposited in MPUJ-PECES. Each individual was identified to genus (Eigenmann 1903(Eigenmann , 1917Mariguela et al 2013;Pastana and Dagosta 2014;Dagosta and Marinho 2016;Lima and Soares 2018). For the identification of the species, taxonomic keys (Géry 1977) and the original description (Géry 1965) were used to verify the identification.…”

“…Specimens were compared with the material deposited at IAvH-P and MPUJ-PECES. Meristic and morphometric data were taken on the left side of all individuals, following Fink and Weitzman (1974), except for head depth, taken from the end of the supraoccipital process, and scales above the lateral line, obtained from the origin of the pelvic-fin (Dagosta 2016;Lima and Soares 2018). All measurements were taken with a digital caliper to the nearest 0.1 mm and are presented in Table 1 as percentages of the standard length (SL), or percentages of head length (HL).…”

“…Moenkhausia Eigenmann, 1903, which is currently considered an artificial genus (Mirande 2010(Mirande , 2018Mariguela et al 2013), comprises 88 nominal species and is one of the most species-rich genera of Characidae (Lima and Soares 2018). The genus exhibits huge diversity in its morphology, coloration, and diet (Pastana and Dagosta 2014;Dagosta and Marinho 2016).…”

Ficha de Moenkhausia cosmops

“…Estados Mato Grosso Biomas Amazônia, Cerrado Bacias Hidrográficas Sub-bacia Paraguai 03, Sub-bacia Tapajós Endêmica do Brasil: Sim Moenkhausia cosmops é endêmica do Brasil e conhecida das bacias dos rios Paraguai e Tapajós, estado do Mato Grosso. A localidade-tipo da espécie é o córrego Vinte e Cinco de Maio, tributário do rio Papagaio, estado do Mato Grosso, Brasil (Lima et al, 2007).…”