Two new species of Hyphessobrycon (Characiformes: Characidae) from the headwaters of the Tapajós and Xingu River basins, Pará, Brazil

Abstract

Two new species of Hyphessobrycon are described from the headwaters of the Tapajós and Xingu River basins, Pará, Brazil. Both new species can be distinguished from congeners by the presence of a vertically elongate humeral blotch, a conspicuous round to vertically oblong caudal-peduncle blotch not extending onto the distal portions of the middle caudal-fin rays, a conspicuous blotch on the central portion of the third infraorbital immediately ventral to the eye, the lack of a conspicuous longitudinal stripe and the lack of sexual dimorphism in the extension of the caudal-peduncle blotch. Hyphessobrycon delimai n. sp. can be distinguished from Hyphessobrycon krenakore n. sp. by the extent of the caudal-peduncle blotch which extends across most of the caudal-peduncle depth (v. restricted to the middle portion of the caudal peduncle), the presence of dark chromatophores uniformly scattered along the length of the interradial membranes of the dorsal, anal and caudal fins (v. concentrated on the distal one-half or one-fourth of the interradial membranes) and the absence of small bony processes on the pelvic and anal fins of mature males (v. small bony processes present).

A new species of Hyphessobrycon Durbin from northeastern Brazil: evidence from morphological data and DNA barcoding (Characiformes, Characidae)

“…It is widely distributed along the river basins of the Neotropical region, from southern Mexico to the La Plata River basin in northeastern Argentina (Carvalho and Malabarba 2015, Teixeira et al 2015, Garcia-Alzate et al 2017), with highest diversity in the Amazon basin (Miquelarena and López 2006, Lima et al 2013, Bragança et al 2015, Carvalho and Malabarba 2015, Marinho et al 2016, Carvalho et al 2017, Moreira and Lima 2017). …”

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

“…Non‐monophyly of the genus Hyphessobrycon is supported by several studies (Malabarba et al ., ; Carvalho & Malabarba, ; Dagosta et al ., ; Teixeira et al ., ). Approximately 25 species are included in Hyphessobrycon sensu stricto , including the type species Hyphessobrycon compressus (Meek 1904).…”

“…5), Hyphessobrycon hexastichos (Bertaco & Carvalho, ), H . delimai (Teixeira et al ., ), Knodus dorsomaculatus Ferreira & Netto‐Ferreira 2010 (Ferreira & Netto‐Ferreira, : Fig. 3), Moenkhausia rubra Pastana & Dagosta, 2014 (Pastana & Dagosta, : Fig.…”

“…Hasemania nambiquara Bertaco & Malabarba 2007(Bertaco & Malabarba, 2007, Hemigrammus arua (Lima et al, 2009: Fig. 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].…”

Hyphessobrycon platyodus (Teleostei: Characiformes), a new species from the Rio Madeira basin, Brazil, with comments on how multicuspid teeth relate to feeding habits in Characidae

“…Hyphessobrycon Durbin 1908 is one of the most species-rich genera of small characid fishes, comprising 143 species currently considered valid (Ohara & Lima, 2015;Teixeira et al, 2016;Lima & Flausino, 2016;Pastana & Ohara, 2016). Species of the genus are widely distributed from southern México to the Río de La Plata in Argentina (Lima et al, 2003), with its highest species richness occurring in the Amazon Basin (Ohara & Lima, 2015).…”