A new species of Bryconops (Characiformes: Iguanodectidae) from the Rio Tapajós basin, Brazil

Abstract

A new species of Bryconops is described from upper rio Juruena drainage, rio Tapajós basin, Amazon basin, state of Mato Grosso, Brazil. The new species is hypothesized as belonging to the subgenus Creatochanes by presenting the posterior extension of maxilla reaching to the junction of second and third infraorbital bones, and the ventroposterior margin of second infraorbital forming a complete border with third infraorbital, resulting in the lack of a naked area between them. The new species is easily distinguished from other species of the subgenus Creatochanes by the color pattern of the caudal fin, which consists of the dorsal lobe conspicuously dark pigmented on its distal half and the ventral lobe dark gray pigmented along its ventral portion below the horizontal through the ventral margin of the caudal peduncle.

The true identity of Bryconops cyrtogaster (Norman), and description of a new species of BryconopsKner (Characiformes: Iguanodectidae) from the Rio Jari, lower Amazon basin

“…(1996) ( e g ., Lima et al ., 2003, Silva‐Oliveira et al ., 2015, 2018) or as a junior synonym of B. melanurus , based on Chernoff et al . (1994) ( e.g ., Koerber et al ., 2017, Wingert et al ., 2018, Fricke et al ., 2019). The present study, based on the examination of syntypes and additional material, confirms the earlier finding by Géry et al .…”

Body Shape Variation in the Bryconops Melanurus Complex (Characiformes: Iguanodectidae) Using Traditional and Geometric Morphometrics

“…Inhabits freshwater habitats with rocky, fast waters. (Guedes et al, 2016;Mol, 2007;Silva-Oliveira et al, 2018, 2019aWingert et al, 2018). The species-group typically lives in either open waters or shore habitats (Mol, 2007).…”

“…Introduction Currently, the genus Bryconops (Kner, 1858) has 27 described species (Table 1 and 2), making it the most species-rich genus in the characiform family Iguanodectidae (Chernoff & Machado-Allison, 1999Silva-Oliveira et al, 2020, 2021. It is comprised of small-sized tetras (Guedes et al, 2016;Silva-Oliveira et al, 2018, 2019aWingert et al, 2018) from the cis-Andean freshwater river basins of South America (including Orinoco, Amazon, and Paraguay), as well as small Atlantic coastal drainages ranging from Venezuela to the Parnaíba River in Brazil (Fricke et al, 2022;Silva-Oliveira et al, 2020, 2021van der Sleen & Moreira, 2018). Species of Bryconops are typically found in lotic habitats with acidic water, whether transparent or black water.…”