Moenkhausia rubra, a new species from rio Juruena, upper rio Tapajós basin, Brazil (Characiformes: Characidae)

Abstract

Moenkhausia rubra, new species, is described from the upper rio Juruena, rio Tapajós basin, Mato Grosso, Brazil. The new species is distinguished from its congeners, except M. hemigrammoides and M. nigromarginata, by the dark pigmentation on the anteriormost rays of both dorsal and anal fins. Moenkhausia rubra is distinguished from the aforementioned species by the number of branched anal-fin rays 17-20 (vs. 20-25), presence of a dark blotch on the caudal peduncle extending to middle caudal-fin rays, absence of longitudinal black zigzag stripes between longitudinal rows of scales on body, and other details of coloration.Moenkhausia rubra, espécie nova, é descrita do alto rio Juruena, bacia do rio Tapajós, Mato Grosso, Brasil. A espécie nova diferencia-se de todos os congêneres, exceto M. hemigrammoides e M. nigromarginata, pela presença de pigmentação escura nos raios mais anteriores das nadadeiras dorsal e anal. Moenkhausia rubra distingui-se das espécies acima mencionadas pelo número de raios ramificados na nadadeira anal 17-20 (vs. 20-25), presença de uma mancha escura no pedúnculo caudal se estendendo até os raios medianos da nadadeira caudal, ausência de faixas em zigue-zague longitudinais entre as séries longitudinais de escamas no corpo, além de outros detalhes de coloração.

New species of Hyphessobrycon from the Rio Teles Pires, Rio Tapajós basin, Brazil (Ostariophysi, Characiformes)

“…5), Hyphessobrycon hexastichos (Bertaco & Carvalho, 2005), H. delimai (Teixeira et al, 2016), Knodus dorsomaculatus Ferreira & Netto-Ferreira 2010 (Ferreira & Netto-Ferreira, 2010: Fig. 3), Moenkhausia rubra Pastana & Dagosta, 2014(Pastana & Dagosta, 2014) to mention some]. The known distribution of Hyphessobrycon pinnistriatus, being also limited to the Tapajós-Juruena ecoregion, reinforces the understanding of this area as a region of high endemism for freshwater fishes.…”

“…Moenkhausia nigromarginata Costa 1994 [ cf . Pastana & Dagosta, : Fig. 6(b)] and Moenkhausia rubra Pastana & Dagosta 2014 [ cf .…”

“…delimai (Teixeira et al ., ), Knodus dorsomaculatus Ferreira & Netto‐Ferreira 2010 (Ferreira & Netto‐Ferreira, : Fig. 3), Moenkhausia rubra Pastana & Dagosta, 2014 (Pastana & Dagosta, : Fig. 5) to mention some].…”

“…Pastana & Dagosta, 2014: Fig. 6(b)] and Moenkhausia rubra Pastana & Dagosta 2014[cf . Pastana & Dagosta, 2014] have a concentration of chromatophores in dorsal-fin rays similar to H. pinnistriatus.…”

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

“…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). Moenkhausia is present throughout South America, mainly in the Orinoco, Ama zonas, and Guianas drainages, where most of its species (69) are distributed (van Der Sleen and Albert 2017).…”