Gymnorhamphichthys britskii Carvalho, Ramos, Albert, 2011

Ota, Renata Rúbia, Deprá, Gabriel de Carvalho, Graça, Weferson Júnio da & Pavanelli, Carla Simone, 2018, Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated, Neotropical Ichthyology 16 (2), pp. 1-111 : 58

Gymnorhamphichthys britskii Carvalho, Ramos, Albert, 2011

Fig. 17

Body elongated and compressed; greatest depth contained 16.6 to 17.9 times in TL; head length 8.5 to 8.7, anal-fin base length 1.4 to 1.6, caudal peduncle length 4.9 to 6.0, preanal distance 7.7 to 8.3 and prepectoral distance 7.8 to 8.2 in LEA; snout length 1.7 to 2.3, horizontal orbital diameter 11.5 to 17.5 and least interorbital width 8.9 to 14.9 in HL. Mouth subterminal; snout relatively short. Pectoral fin with 13-15 rays and anal fin with 141-172 rays ( Graça, Pavanelli, 2007; Carvalho et al., 2011). Ground color pale yellow; three dark-brown inconspicuous longitudinal stripes on flank; darkbrown transverse bars on dorsolateral region. Hyaline fins.

Maximum total length. 180.0 mm.

Biological data. Lives in different habitats, from small streams to large size rivers ( Carvalho et al., 2011).

Distribution. Río de La Plata basin.

Remarks. Gymnorhamphichthys britskii was identified as Gymnorhamphichthys sp. by Graça, Pavanelli (2007). Carvalho et al. (2011) described the new species from the río de La Plata basin. Gymnorhamphichthys britskii has been sampled in the upper rio Paraná floodplain recently, with no anterior records in the basin. Therefore, this species is considered as non-native from the upper rio Paraná, and its occurrence in the region can be associated with its introduction as a live bait by anglers, or with the filling of the Itaipu Reservoir and the consequent inundation of the Sete Quedas Falls.

Figures

Fig. 17. a. Brachyhypopomus gauderio, NUP 2510, 112.2, lagoa do Aurélio, Taquarussu, State of Mato Grosso do Sul. b. Gymnorhamphichthys britskii, NUP 3337, 115.0 mm TL, rio Baía, Taquarussu, State of Mato Grosso do Sul. c. Rhamphichthys hahni, 567.3 mm TL, uncat. d. Eigenmannia guairaca, NUP 16151, 112.3 mm TL, córrego Água Boa, tributary of the rio Iguatemi, Mundo Novo, Mato Grosso do Sul State. e. Eigenmannia trilineata, 109.2 mm TL, fresh specimen, uncat. f. Eigenmannia virescens, 205.0 mm TL, uncat. g. Sternopygus macrurus, NUP 2096, 280.0 mm TL, rio Paraná, Porto Rico, State of Paraná.