Moenkhausia bonita Benine, Castro, Sabino, 2004

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 : 30

Moenkhausia bonita Benine, Castro, Sabino, 2004

Fig. 8

Body elongated; greatest depth contained 2.9 to 3.4 and caudal peduncle depth 8.5 to 9.5 times in SL; head length 3.5 to 3.9, predorsal distance 1.9 to 2.0 and caudal peduncle length 7.4 to 9.0 in SL; snout length 3.4 to 4.2, horizontal orbital diameter 2.0 to 2.4 and least interorbital width 3.0 to 3.5 in HL. Mouth terminal; inner row of premaxilla with 5 teeth, outer with 2-5, dentary with 4 and maxilla with 2 or 3 teeth. Lateral line complete with 29-31 pored scales, sometimes disrupted or incomplete 6 to 13 pored scales; longitudinal series with 29-31 scales; transverse series above lateral line with 5 scale rows and below with 3 scale rows. Dorsal fin with 11 rays, pectoral fin with 12-13 rays, pelvic fin with 8 rays, anal fin with 24-26 rays and caudal fin with 19 rays. Ground color silvery to pale yellow; darkbrown longitudinal stripe from opercle (conspicuously from vertical through dorsal-fin origin) to median caudal fin rays; distal portion of caudal fin lobes equally dark-brown.

Maximum standard length. 43.8 mm.

Biological data. Lives in marginal backwaters with low current speeds and feeds mainly on terrestrial insects (Diptera and Coleoptera) ( Benine et al., 2004).

Distribution. Upper rio Paraná and río Paraguay basins.

Remarks. Some specimens of Moenkhausia bonita were identified as Hemigrammus marginatus by Graça, Pavanelli (2007), who reported some specimens with lateral line completely pored, and others with lateral line disrupted or incompletely pored.R. P.Ota andA. G. Bifi (oral communication, 2009) were the first to identify M. bonita in the upper rio Paraná floodplain, formelly restricted to the type-locality (Baía Bonita) in its original description ( Benine et al., 2004). Hemigrammus marginatus was restricted the distribution of H. marginatus to the rio São Francisco basin and rivers of northeastern Brazil by Ota, RP et al. (2015). Mota et al. (2018, in press), in a molecular analysis, concluded that the specimens from the upper rio Paraná floodplain, including those with variation in lateral line (complete, disrupted and incomplete), belong to M. bonita .

Figures

Fig. 8. a. Hemigrammus ora, NUP 18973, 26.4 mm SL, ressaco do Pau Veio, tributary of the rio Paraná, State of Paraná. b. Hyphessobrycon eques, 32.0 mm SL, fresh specimen, uncat. c. Hyphessobrycon moniliger (top, female, NUP 1248, 29.9 mm SL, ribeirão Bocaina, tributary of the rio Meia Ponte, Piracanjuba, State of Goiás; bottom, male, NUP 16949, 26.2 mm SL, lagoa da Onça, tributary of the rio Baía, Taquarussu, State of Mato Grosso do Sul). d. Moenkhausia australe, NUP 11115, 45.0 mm SL, riacho Caracu, tributary of the rio Paraná, Porto Rico, State of Paraná. e. Moenkhausia bonita, NUP 11700, 30.1 mm SL, lagoa das Pombas, tributary of the rio Paraná, Porto Rico, State of Paraná. f. Moenkhausia forestii, NUP 16583, 36.0 mm SL, rio Baía, tributary of the rio Paraná, Taquarussu, State of Mato Grosso do Sul. g. Moenkhausia cf. gracilima, NUP 11099, 33.1 mm SL, ribeirão São Pedro, tributary of the rio Paraná, São Pedro do Paraná, State of Paraná. h. Moenkhausia aff. intermedia, NUP 2389, 68.4 mm SL, Segredo Reservoir, Mangueirinha, State of Paraná. i. Moenkhausia sanctaefilomenae, 24.1 mm SL, uncat.