The South American Electric Glass Knifefish Genus<i>Distocyclus</i>(Gymnotiformes: Sternopygidae): Redefinition and Revision

Dutra, Guilherme Moreira; Santana, Carlos David de; Vari, Richard P.; Wosiacki, Wolmar Benjamin

doi:10.1643/ci-13-066

Cited by 15 publications

(20 citation statements)

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“…absence); dentary with 15–33 teeth arranged in two or three complete rows ( vs . a single tooth row limited to the anterior portion of dentary) [7]. Further, the new species is distinguished from Rhabdolichops by the premaxilla approximately rectangular ( vs .…”

Section: Discussionmentioning

confidence: 99%

“…They inhabit floodplains, terra firme streams, river channels or caves [4,5], and use a monophasic electric organ discharge to discharges ranging from 100 to 780 Hz in order to communicate and explore environment [6]. Eigenmannia , known as the “glass electric knifefish” or “ituí transparente” in the aquarium trade, is the most species-rich genus in Sternopygidae, currently with 22 valid species (besides “ Eigenmannia ” goajira Schultz provisionally incertae sedis ; [7]) widely distributed from Río Tuíra basin, Panamá, to Río de La Plata basin, Argentina [8–10]. Its largest diversity is found in the Amazon basin, where approximately half of the known species occur.…”

Section: Introductionmentioning

confidence: 99%

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

Peixoto

Ohara

2019

PLoS ONE

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A new species of Eigenmannia is described from the rio Mutum, tributary of upper rio Juruena, rio Tapajós basin, Comodoro, Mato Grosso, Brazil. The new species is distinguished from all congeners by coloration pattern, position of the mouth, number of scales rows above lateral line, number of premaxillary and dentary teeth, number of precaudal vertebrae, orbital diameter, mouth width, relative depth of posterodorsal expansion on infraorbitals 1+2 and relative size of coronomeckelian bone. Comments on potentially useful characters in phylogenetic studies derived from musculature, discussion on Eigenmannia species-group and the first dichotomous key for Eigenmannia are provided.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Peixoto

Ohara

2019

PLoS ONE

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“…Thus, we opt to identify E. sayona as a member of Eigenmannia by its possession of all synapomorphies common to the Eigenmanniinae (Albert, 2001), and the absence of most characters diagnostic to other genera of Sternopygidae. Dutra et al, 2014), of which E. sayona shares none. Vari et al (2012) proposed four synapomorphies for Archolaemus, all of which are absent in E. sayona, except for the ventral surface of the upper lip porous, possibly representing a case of convergence noted another possible convergence of upper lip surface morphology between Archolaemus and an undescribed species in the E. trilineata group).…”

Section: Discussionmentioning

confidence: 98%

A new species of the Eigenmannia trilineata (Gymnotiformes: Sternopygidae) species group from the río Orinoco basin, Venezuela

Peixoto

Waltz²

2017

Neotrop. ichthyol.

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A new species of the Eigenmannia trilineata species group is described from the río Orinoco basin, Venezuela. The new species is distinguished from congeners by a unique set of characters including an ossified basibranchial 1; 198-217 anal-fin rays; suborbital depth, 21.3-26.1% HL; length of anterodorsal process of maxilla equal to the width of the posterior nostril; premaxilla with 17 teeth distributed in three rows; hyaline pectoral and anal fins; and number of scale series above lateral line, 9-10. It raises the number of species allocated to the Eigenmannia trilineata species group to 13 and the number of species within the genus to 18.Keywords: Biodiversity, Electric-fishes, Taxonomy, Tuvira.Se describe una nueva especie del grupo Eigenmannia trilineata de la cuenca del río Orinoco, Venezuela. La nueva especie se distingue de sus congéneres por una combinación única de caracteres, incluyendo el basibranquial 1 osificado; número de radios de la anal, 198-217; profundidad del suborbital, 21.3-26.1% HL; longitud del proceso anterodorsal de la maxila igual al ancho de la narina posterior; 17 dientes premaxilares distribuidos en tres hileras; aletas pectoral y anal hialinas; y 9-10 hileras de escamas sobre la serie de la línea lateral. La presente contribución eleva el número de especies del grupo Eigenmannia trilineata a 13, y a 18 aquellas dentro del género.

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“…; Rhamphichthyidae: Gymnorhamphichthys 6 spp., Hypopygus 9 spp., Iracema 1 sp., Rhamphichthys 9 spp., Steatogenys 3 spp.). Brachyhypopomus is also one of the most diverse of all gymnotiform genera–surpassed only by Gymnotus , with 40 species [ 77 , 117 ], and Sternarchorhynchus with 32 [ 29 ], and closely matched only by Apteronotus , with 28 species–the monophyly of which is questionable [ 23 ], and Eigenmannia , with 16 species [ 118 ] (or 15 species, see Dutra et al [ 119 ] for comments on the validity of E . goajira ).…”

Section: Discussionmentioning

confidence: 99%

Phylogenetic Systematics, Biogeography, and Ecology of the Electric Fish Genus Brachyhypopomus (Ostariophysi: Gymnotiformes)

et al. 2016

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A species-level phylogenetic reconstruction of the Neotropical bluntnose knifefish genus Brachyhypopomus (Gymnotiformes, Hypopomidae) is presented, based on 60 morphological characters, approximately 1100 base pairs of the mitochondrial cytb gene, and approximately 1000 base pairs of the nuclear rag2 gene. The phylogeny includes 28 species of Brachyhypopomus and nine outgroup species from nine other gymnotiform genera, including seven in the superfamily Rhamphichthyoidea (Hypopomidae and Rhamphichthyidae). Parsimony and Bayesian total evidence phylogenetic analyses confirm the monophyly of the genus, and identify nine robust species groups. Homoplastic osteological characters associated with diminutive body size and occurrence in small stream habitats, including loss of squamation and simplifications of the skeleton, appear to mislead a phylogenetic analysis based on morphological characters alone–resulting in the incorrect placing of Microsternarchus + Racenisia in a position deeply nested within Brachyhypopomus. Consideration of geographical distribution in light of the total evidence phylogeny indicates an origin for Brachyhypopomus in Greater Amazonia (the superbasin comprising the Amazon, Orinoco and major Guiana drainages), with subsequent dispersal and vicariance in peripheral basins, including the La Plata, the São Francisco, and trans-Andean basins of northwest South America and Central America. The ancestral habitat of Brachyhypopomus likely resembled the normoxic, low-conductivity terra firme stream system occupied by many extant species, and the genus has subsequently occupied a wide range of terra firme and floodplain habitats including low- and high-conductivity systems, and normoxic and hypoxic systems. Adaptations for impedance matching to high conductivity, and/or for air breathing in hypoxic systems have attended these habitat transitions. Several species of Brachyhypopomus are eurytopic with respect to habitat occupancy and these generally exhibit wider geographical ranges than stenotopic species.

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The South American Electric Glass Knifefish GenusDistocyclus(Gymnotiformes: Sternopygidae): Redefinition and Revision

Cited by 15 publications

References 15 publications

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

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

A new species of the Eigenmannia trilineata (Gymnotiformes: Sternopygidae) species group from the río Orinoco basin, Venezuela

Phylogenetic Systematics, Biogeography, and Ecology of the Electric Fish Genus Brachyhypopomus (Ostariophysi: Gymnotiformes)

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