[Ichthyology • 2017] Eigenmannia sayona • A New Species of the Eigenmannia trilineata Species Group (Gymnotiformes: Sternopygidae) from the río Orinoco Basin, Venezuela

  Eigenmannia sayona

Peixoto & Waltz, 2017
DOI: 10.1590/1982-0224-20150199 

Abstract

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.

Fig. 1 Holotype of Eigenmannia sayona, new species, MZUSP 96497, 131.8 mm LEA, Venezuela, Bolivar, Cedeño, río Orinoco, río Parguaza, near the community of Puente Parhueña. a. Lateral view of head and body; b. Lateral view of head. 

Etymology. The specific epithet “sayona” is assigned to the new species in reference to “La Sayona”, a spirit of philanderous vengeance in Venezuelan lore. A noun in apposition.

Geographic distribution. Eigenmannia sayona is known from río Orinoco basin, from río Parguaza, río Apure, and Laguna de Castilleros, Venezuela.

Luiz A. W. Peixoto and Brandon T. Waltz. 2017. A New Species of the Eigenmannia trilineata (Gymnotiformes: Sternopygidae) Species Group from the río Orinoco Basin, Venezuela. Neotropical Ichthyology. 15(1); e150199. DOI: 10.1590/1982-0224-20150199.

[Ichthyology • 2017] Eigenmannia meeki • A New Species of the Glass Electric Knifefish Genus Eigenmannia Jordan and Evermann (Gymnotiformes: Sternopygidae) from Río Tuíra Basin, Panama

Eigenmannia meeki  

Dutra, de Santana & Wosiacki, 2017

  DOI: 10.1643/CI-16-439 

A new species of Eigenmannia is described from the Río Pucuro, Río Tuíra basin, Panama. It is diagnosed from all congeners by the position of the mouth, the color pattern, the number of anal-fin rays, the number of scales on lateral line, the number of scales rows above the lateral line, the number and arrangement of teeth on the dentary, the number of precaudal vertebrae, the relative depth of the posterodorsal expansion on infraorbitals 1+2, and the relative size of coronomeckelian bone. The new species is the first Eigenmannia described from Central American drainages, and the northernmost species of the genus.

Fig. 1. Eigenmannia meeki, USNM 293171, holotype, 235.7 mm LEA, Panama, Darien, Río Púcuro, Río Tuíra basin.

  DOI: 10.1643/CI-16-439  

Distribution.— Eigenmannia meeki is known from its type locality in the Río Púcuro, and Río Chucunaque in the Río Tuíra basin, Darien Province, Panama (Fig. 5). 

 Etymology.— The specific epithet, meeki, is in honor of Seth Eugene Meek (1859–1914) who made many contributions to the knowledge of the diversity of the fishes of Panama

Guilherme Moreira Dutra, Carlos David de Santana and Wolmar Benjamin Wosiacki. 2017.  A New Species of the Glass Electric Knifefish Genus Eigenmannia Jordan and Evermann (Teleostei: Gymnotiformes: Sternopygidae) from Río Tuíra Basin, Panama.   

 Copeia. 105(1); 85-91.  DOI: 10.1643/CI-16-439

Una nueva especie de Eigenmannia es descrita del río Pucuro, que pertenece a la cuenca del Río Tuíra, Panamá. Esta diagnosticada de las demás especies del género por la posición de la boca, el padrón de coloración, el número de radios de la aleta anal, el número de escamas de la línea lateral, el número de hileras de escamas arriba de la línea lateral, el número y disposición de los dientes en el hueso dentario, el número de vertebras pre-caudales, el tamaño relativo de la expansión postero-dorsal del hueso infraorbital 1+2 y el tamaño relativo del hueso corono-meckeliano. Esta nueva especie es la primera Eigenmannia descrita de las cuencas de América Central y además es la especie con la distribución más boreal del género.

[Ichthyology • 2016] Eigenmannia correntes • A New Species of Eigenmannia Jordan and Evermann (Gymnotiformes: Sternopygidae) from the upper rio Paraguai basin, Brazil

Eigenmannia correntes 

  Campos-da-Paz & Queiroz, 2017  

DOI:  10.11646/zootaxa.4216.1.5

Abstract

Eigenmannia correntes, a new species belonging to the Eigenmannia trilineata species-group, is described from tributaries of rio Correntes, a major affluent of the rio Piquiri system, upper rio Paraguai basin (Mato Grosso and Mato Grosso do Sul states, Brazil). Eigenmannia correntes is included in the currently poorly defined sternopygid genus Eigenmannia (Ostariophysi: Gymnotiformes) by presenting characters that are either primitive or of uncertain polarity, such as eyes covered by skin, scales present over entire postcranial portion of body, teeth absent from oral valve, infraorbital bones 1+2 with enlarged posterodorsal expansion, and gill rakers short and unossified. The new species is distinguished from all congeners, except those species included in the Eigenmannia trilineata species-group, by the presence of a conspicuous superior midlateral stripe (synapomorphy of this clade). Eigenmannia correntes can be differentiated from all members of the Eigenmannia trilineata species-group, except E. vicentespelaea, E. waiwai and E. besouro, by its subterminal mouth (vs. terminal in remaining species of that group). Further, it differs from these aforementioned species by a number of meristic and morphometric characters, including number of premaxillary and dentary teeth, number of longitudinal series of scales above lateral line, number of pectoral-fin and anal-fin rays, eye diameter, postorbital distance, and snout length. Finally, notes on reproduction and parasitism for E. correntes are presented.

Keywords: Pisces, Eigenmannia trilineata, Eigenmanninae, glass knifefish, Systematics, taxonomy

Etymology. The specific epithet correntes refers to the rio Correntes, the main river at the rio Piquiri system, upper rio Paraguai basin, from where all specimens used in the original description were collected. A noun in apposition.

Ricardo Campos-Da-Paz and Igor Raposo Queiroz. 2017. A New Species of Eigenmannia Jordan and Evermann (Gymnotiformes: Sternopygidae) from the upper rio Paraguai basin.
Zootaxa. 4216(1); 073–084.   DOI:  10.11646/zootaxa.4216.1.5

[Ichthyology • 2016] Eigenmannia besouro • A New Species of the Eigenmannia trilineata species-group (Gymnotiformes: Sternopygidae) from the rio São Francisco basin, northeastern Brazil

Eigenmannia besouro 

Peixoto & Wosiacki, 2016

 DOI: 10.11646/zootaxa.4126.2.6 

Abstract

A new species of the Eigenmannia trilineata species-group is described from the rio São Francisco basin, Brazil. It is distinguished from closely related species by a unique set of characters, including a subterminal mouth, the presence of ii,13–14 pectoral-fin rays, a coronomeckelian bone that is 30% the length of Meckel’s cartilage, the specific pattern of the dentition of the premaxilla and dentary, and the more anterior origin of the superior midlateral stripe. Comments on species of the E. trilineata species-group are presented.

Keywords: Pisces, diversity, glass knifefish, electric fish, species group

FIGURE 1. Eigenmannia besouro, MZUSP 57890, holotype, 91.9 mm LEA, Brazil, Bahia, São Desidério, rio São Francisco, rio Grande. (A) Left lateral view of body; (B) Head. 

Distribution. Eigenmannia besouro is known from tributaries of the left margin of rio São Francisco, Bahia, northeastern Brazil (Fig. 5).

Etymology. The species name, besouro (‘beetle’ in Portuguese) is in honor of Manoel Henrique Pereira, known as Besouro Mangangá (‘The Mangangá Beetle’), a native of the Recôncavo region of Bahia, and a legendary figure in the Afro-Brazilian martial art capoeira; a noun in opposition.

Peixoto, Luiz A. W. & Wolmar B. Wosiacki. 2016. Eigenmannia besouro, A New Species of the Eigenmannia trilineata species-group (Gymnotiformes: Sternopygidae) from the rio São Francisco basin, northeastern Brazil. Zootaxa. 4126(2); 262–270.  DOI: 10.11646/zootaxa.4126.2.6

researchgate.net/publication/304032886_Eigenmannia_besouro_a_new_species_of_the_Eigenmannia_trilineata_species-group_Gymnotiformes_Sternopygidae_from_the_rio_Sao_Francisco_basin_northeastern_Brazil

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[Ichthyology • 2006] Morphology and Distribution of the Cave Knifefish Eigenmannia vicentespelaea Triques, 1996 (Gymnotiformes: Sternopygidae) from Central Brazil, with an expanded Diagnosis and comments on Subterranean Evolution

(upper) Living specimen of Eigenmannia vicentespelaea with relatively well developed eyes and translucent aspect. Note the three longitudinal stripes (LEA: 121.9 mm). Photo: José Sabino.
(lower) Sinkhole of São Vicente Cave System, São Domingos karst area, Goiás State, Central Brazil – type locality of Eigenmannia vicentespelaea Triques, 1996. Photo: E. M. Bichuette

We present herein data on morphology and distribution of the cave knifefish Eigenmannia vicentespelaea Triques, 1996, from the São Domingos karst area, Central Brazil, comparing it to the epigean (surface) species, Eigenmannia sp., found in the same area (but not syntopic with E. vicentespelaea) and also with congeners from other localities. Collecting sites comprising epigean and subterranean stream reaches in São Domingos were sampled during the dry seasons of 1999, 2000, and 2001 using several methods. Preserved specimens of E. vicentespelaea (n=25, including holotype and paratype) and of Eigenmannia sp. (n=15) were compared with focus on morphometric characters, body pigmentation and eye condition. A combination of characters separates E. vicentespelaea from Eigenmannia sp. and other congeners: the length from the tip of the snout to the posterior of the anal fin base, ocular diameter: head length and pre-anal distance: head length proportions, and body pigmentation. A wider morphometric variation in E. vicentespelaea is described than that reported in the original description (based on two specimens).

Key words: Morphometric data, electric fishes, cave environment, São Domingos karst area.

Maria Elina Bichuette and Eleonora Trajano. 2006. Morphology and Distribution of the Cave Knifefish Eigenmannia vicentespelaea Triques, 1996 (Gymnotiformes: Sternopygidae) from Central Brazil, with an expanded Diagnosis and comments on Subterranean Evolution. Neotropical Ichthyology. 4(1); 99-105

http://scielo.br/pdf/ni/v4n1/v4n1a11.pdf