Trachydoras paraguayensis (Eigenmann, Ward, 1907)

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 : 67

Trachydoras paraguayensis (Eigenmann, Ward, 1907)

Fig. 20

Body deep; greatest body depth contained 2.7 to 3.1, head length 3.3 to 3.8 times in SL; snout length contained 1.9 to 2.2, horizontal orbital diameter 2.5 to 3.1 and least interorbital width 2.2 to 2.8 times in HL; orbital diameter contained 1.0 to 1.3 times in interorbital width. Mouth subterminal; with dentigerous plates in both premaxilla and dentary. Lateral line with 28-30 plates. Dorsal fin with I,6, pectoral fin with I,7, pelvic fin with 7 and anal fin with 12- 14 rays. Ground color greyish dorsally, whitish to yellowish ventrally. Hyaline or light-beige fins; caudal fin with darkgrey oblique stripe on each lobe ( Graça, Pavanelli, 2007).

Maximum standard length. 150.0 mm ( Graça, Pavanelli, 2007).

Distribution. Paraná-Paraguay system.

Remarks. Trachydoras paraguayensis is a non-native species from the upper rio Paraná, and its occurrence can be associated with the filling of the Itaipu Reservoir and the consequent inundation of the Sete Quedas Falls.

Figures

Fig. 20. a. Ossancora eigenmanni, NUP 6326, 99.1 mm SL, Rosana Reservoir, rio Paranapanema, Diamante do Norte, State of Paraná. b. Platydoras armatulus, NUP 1052, 132.9 mm SL, baia Sinhá Mariana, Barão de Melgaço, State of Mato Grosso. c. Pterodoras granulosus, 600.0 mm SL, fresh specimen, uncat. d. Rhinodoras dorbignyi, 135.5 mm SL, fresh specimen, uncat. e. Trachydoras paraguayensis, 125.0 mm SL, fresh specimen, uncat.