Rhamphichthys hahni (Meinken, 1937)

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 : 59

Rhamphichthys hahni (Meinken, 1937)

Fig. 17

Body elongated and compressed; greatest depth contained 6.4 to 9.1 times in TL; head length 6.2 to 7.1, anal-fin base length 1.2, caudal-peduncle length 10.0 to 13.3 in LEA; snout length 1.9 to 2.1, horizontal orbital diameter 20.0 to 23.0 and least interorbital width 6.1 to 7.0 in HL. Mouth terminal; long snout. Pectoral fin with 17-20 rays and anal fin with 337-400 rays; transverse series above lateral line with 20-22 scale rows. Ground color pale brown; darkbrown transverse and irregular bars and blotches. Fins with dark-brown spots, sometimes forming longitudinal irregular stripes ( Graça, Pavanelli, 2007).

Maximum total length. 800.0 mm ( Graça, Pavanelli, 2007).

Distribution. Rio Paraná basin.

Remarks. Rhamphichthys hahni has been recently captured in the upper rio Paraná floodplain, with no anterior records in the basin. Therefore, this species is considered as nonnative 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.