A new species of Eigenmannia Jordan & Evermann (Teleostei: Gymnotiformes: Sternopygidae) from Río Ventuari, Venezuela

Abstract

A new species of Eigenmannia is described from the Río Ventuari, Río Orinoco basin, Venezuela. It is distinguished from congeners by the presence of a bony dorsolateral flange on the dentary, the presence of teeth attached along a bony dorsolateral flange, and by the first premaxillary teeth attached to the anteroventral margin of the premaxilla. It is further distinguished from all remain congeners by a combination of characters, including a subterminal mouth, 99–107 scales along the lateral line until the end of the anal fin, and ii, 16–17 pectoral-fin rays.

A new species of Eigenmannia Jordan & Evermann (Gymnotiformes: Sternopygidae) from rio Tapajós, Brazil, with discussion on its species group and the myology within Eigenmanniinae

“…Due to the doubtful status of Eigenmannia as a monophyletic genus, the inclusion of the E . sirius in Eigenmannia is provisionally justified by the presence in the former of the synapomorphies of Eigenmanniinae [15,19–21], and by the absence of those synapomorphies of the remaining Eigenmanniinae genera as discussed by previous studies [9,10,23,25,45]. In addition to our conservative position regarding the proposal of a new genus, we detail the differences between the species described herein and the current definition of all eigenmanniin genera (for external features see Diagnosis).…”

“…In addition to the comparative material examined and listed in [8,9,25,45], the following species were examined: Apteronotidae: Adontosternarchus balaenops : MZUSP 83219 (2 msc of 45, 165.2–175.3 mm L EA ), rio Amazonas, Pará, Brazil. Apteronotus albifrons : MZUSP 89044 (1 msc of 3, 75.8 mm L EA ), rio Araguaia, Goiás, Brazil.…”

Morphology‐based phylogeny of Eigenmanniinae Mago‐Leccia, 1978 (Teleostei: Gymnotiformes: Sternopygidae), with a new classification

“…This apomorphic condition was proposed as a diagnostic character for E . oradens by Dutra et al (2018), who also commented on the presence of this condition in all aforementioned taxa. …”

“…These values were normalized in a range that corresponds from 0 (minimum value) to 1 (maximum value; for observed values and their normalizations see Table –) for analyses, following the methodology synthesized and justified in Ferrer et al (2014). The range of the observed values for all taxa were acquired directly from specimens analyzed herein, and compiled from the literature in order to apply the largest range known for each count [ Archolaemus species: Vari et al (2012); Distocyclus species: Dutra et al, (2014), Meunier et al, (2014); Eigenmannia species: Peixoto et al (2015), Peixoto and Wosiacki (2016), Peixoto and Waltz (2017), Campos‐da‐Paz and Queiroz (2017), Dutra et al (2017), Dutra et al (2018); Japigny : Meunier et al (2011); Rhabdolichops species: Lundberg and Mago‐Leccia (1986), Correa et al, (2006); Brachyhypopomus brevirostris : Crampton et al (2016); Gymnotus coropinae : Crampton and Albert (2003); Sternarchorhamphus muelleri : Campos‐da‐Paz (1995)].…”

New species of glass knifefish genus Eigenmannia (Gymnotiformes: Sternopygidae) with comments on the morphology and function of the enlarged cephalic lateral‐line canals of Sternopygidae

“…Despite several recent taxonomic contributions (Campos‐da‐Paz & Queiroz, 2017; Dutra et al ., 2017, 2018; Herrera‐Collazos et al ., 2020; Peixoto et al ., 2015; Peixoto & Ohara, 2019; Peixoto & Waltz, 2017; Peixoto & Wosiacki, 2016; Waltz & Albert, 2018), the monophyly of Eigenmannia still awaits further phylogenetic studies, and currently its infrageneric classification is based on informal groups of species (see discussion in Peixoto & Ohara, 2019: Table 2). Among these, the Eigenmannia trilineata species group allocates the highest number of species and encompasses taxa that exhibit a midlateral stripe between the LL and the proximal portion of the pterygiophores of the anal fin, named the ‘superior midlateral stripe’ (Peixoto et al ., 2015; Peixoto & Wosiacki, 2016).…”