Guairaca Knifefish

distribution

Distribution: Riacho Água do Ó, tributary of Paranapanema River, upper Paraná River basin, Paraná, Brazil (Peixoto et al., 2015).

Checklist of Gymnotiformes (Osteichthyes: Ostariophysi) and catalogue of primary types

materials_examined

Paratypes: 1 lot, 9 specimens — NUP 6467, 8 + 1 c & s, 81.4 – 135.8 mm LEA: Brazil, Paraná, Santa Fé, riacho Água do Ó, tributary of rio Paranapanema, upper rio Paraná basin, 23 ° 01 ’ 08 ” S, 51 ° 51 ’ 37.8 ” W, C. Pavanelli and others, 16 Dec 2008.

Catalog of type specimens of the fish collection of the Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura (NUP), Universidade Estadual de Maringá Paraná, Brazil

description

Body elongated and compressed; greatest body depth contained 5.9 to 7.0 times in TL; head length 6.5 to 8.3, anal-fin base length 0.7 to 1.2, caudal filament length 2.8 to 4.5, preanal distance 5.0 to 6.0 and prepectoral distance 6.1 to 7.7 in LEA; snout length 3.8 to 4.9, horizontal orbital diameter 6.7 to 8.8 and least interorbital width 2.7 to 3.5 in HL. Mouth terminal; premaxilla with 9 or 10 teeth distributed in two rows. Pectoral fin with 12 or 13 rays and anal fin with 151 - 170 rays. Lateral line complete, with 110 - 143 pored scales; transverse series above lateral line with 9 - 11 scale rows. Ground color pale brown; four dark-brown longitudinal stripes on flank (one superior medial, one lateral line, one inferior medial and one at anal-fin base). Maximum total length. 173.0 mm TL.

Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated

discussion

Remarks. Peixoto et al. (2015) reviewed the Eigenmannia trilineata species-group, described the new species, E. guaiaraca, from the riacho Água do Ó, tributary of the rio Paranapanema, upper rio Paraná basin, and restricted the distribution of E. trilineata to the lower rio Paraná basin. Analyzing additional material hosted at Coleção Ictiológica do Nupélia, specimens similar to E. guairaca were found in tributaries of the rio Iguatemi, right bank of the upper rio Paraná, and specimens similar to those redescribed as E. trilineata by Peixoto et al. (2015) in the upper rio Paraná floodplain and some of its tributaries (e. g. rio Paracaí). Therefore, the occurrence of both species in the studied region has been recorded.

Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated