Piabarchus stramineus (Eigenmann, 1908)

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 : 42

Piabarchus stramineus (Eigenmann, 1908)

Fig. 11

Body elongated; greatest body depth contained 4.0 to 4.2 and caudal peduncle depth 10.6 to 11.8 times in SL; head length 4.6 to 4.8, predorsal distance 2.1 to 2.2, and caudal peduncle length 6.8 to 7.4; snout length 3.6 to 4.0, horizontal orbital diameter 2.0 to 2.5 and interorbital distance 2.5 to 2.8 in HL. Mouth terminal; inner row of premaxilla with 4 teeth, outer row with 5 teeth; dentary with 9 or 10 teeth, and maxilla with 2 teeth. Lateral line with 36-38 pored scales; transverse series above lateral line with 4 rows and below with 3. Dorsal fin with 11 or 12, pectoral fin with 14 or 15, pelvic fin 9, anal fin with 20-22, and caudal with 19 rays. Ground color silvery to yellowish; silvery longitudinal band (brown or grey in preserved specimens), from humeral spot to caudal peduncle; black oval, vertically elongated, humeral spot. Caudal fin yellowish or oranged; remaining fins hyaline, with dusky border ( Graça, Pavanelli, 2007).

Maximum standard length. 84.0 mm ( Graça, Pavanelli, 2007).

Distribution. Río de la Plata basin and rio São Francisco basin.

Remarks. Piabarchus stramineus was identified as B. stramineus by Graça, Pavanelli (2007). Thomaz et al. (2015), in a molecular phylogeny of the Stevardiinae , proposed the new combination.

Figures

Fig. 11. a. Bryconamericus exodon, 55.8 mm SL, fresh specimen, uncat. b. Bryconamericus aff. iheringii, NUP 824, 50.0 mm SL, rio São Vicente, Missal, State of Paraná. c. Bryconamericus turiuba, NUP 6170, 59.3 mm SL, rio Iguatemi, tributary of the rio Paraná, Coronel Sapucaia, State of Mato Grosso do Sul. d. Diapoma guarani, NUP 17635, 31.2 mm SL, Canal da Piracema, Foz do Iguaçu, State of Paraná. e. Knodus moenkhausii, NUP 3211, 48.0 mm SL, riacho Água Nanci, Porto Rico, State of Paraná. f. Piabarchus stramineus, NUP 3298, 70.0 mm SL, rio Paraná, Porto Rico, State of Paraná. g. Piabina argentea, 68.0 mm SL, uncat. h. Planaltina britskii, NUP 11802, 27.5 mm SL, lagoa Genipapo (ilha Porto Rico, Foz do Iguaçu, State of Paraná.