Apteronotus aff. albifrons (Linnaeus, 1766)

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 : 55

Apteronotus aff. albifrons (Linnaeus, 1766)

Fig. 16

Body elongated and compressed; greatest depth contained 5.5 to 6.2 times in TL; head length 5.5 to 6.0, anal-fin base length 1.2 to 1.5, caudal-peduncle length 5.0 to 6.6, preanal distance 6.1 to 7.5 and prepectoral distance 5.5 to 6.0 in LEA; snout length 2.7 to 4.7, horizontal orbital diameter 9.0 to 16.7 and least interorbital width 3.9 to 4.7 in HL. Mouth terminal. Pectoral fin with 15-16, anal fin with 170-192 and caudal fin with 17 to 20 rays. Transversal series above lateral line with 15-16 scale rows (Campo-da- Paz, 1997). Ground color dark-brown, with brownish-white middorsal stripe from tip of lower jaw to nape, continuing as narrower line until about middle of body (occasionally faded or discontinuous); region around branchial aperture, including isthmus, brownish-white; wide brownish-white transverse bar across tail and posterior portion of anal fin; narrower brownish-white transverse bar across posterior portion of caudal peduncle and caudal-fin base. Distal portion of caudal fin brownish white; fins otherwise darkbrown ( Graça, Pavanelli, 2007).

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

Distribution. Drainages from Venezuela to Paraguay and río Paraná basin.

Figures

Fig. 16. a. Apteronotus acidops, NUP 1750, 240.0 mm TL, Itaipu Reservoir, Guaíra, State of Paraná. b. Apteronotus aff. albifrons, 100.0 mm TL, uncat. c. Apteronotus cf. caudimaculosus, 260.0 mm TL, uncat. d. Apteronotus ellisi, 128.2 mm TL, uncat. e. Sternarchorhynchus britskii, 212.0 mm TL, uncat. f. Gymnotus inaequilabiatus, 238.0 mm TL, uncat. g. Gymnotus pantanal, NUP 13328, 138.6 mm SL, ribeirão Jacutinga, São Jorge do Ivaí, State of Paraná. h. Gymnotus paraguensis, 250.0 mm TL, uncat. i. Gymnotus sylvius, MZUSP 83538, paratype, 260.0 mm TL, rio Ribeira de Iguape, next to Miracatu, Miracatu, State of São Paulo.