Trichomycterus diabolus Bockmann, Casatti, de Pinna, 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 : 89

Trichomycterus diabolus Bockmann, Casatti, de Pinna, 2004

Fig. 31

Body cylindric anteriorly, compressed posteriorly; greatest depth contained 5.8 to 8.5 times in SL, head length 3.9 to 4.5 and predorsal distance 1.5 to 1.6 in SL; snout length 5.3 to 9.1, horizontal orbital diameter 3.2 and least interorbital width 4.0 to 5.1 in HL. Mouth terminal; premaxilla and dentary with several rows of conical teeth. Dorsal fin with 9 or 10, pectoral fin with 6, pelvic fin with 5 and anal fin with 8 rays. Ground color yellow to pale brown; dark-brown blotches over whole body. Caudal fin pale brown, mostly hyaline, with dark-brown transverse bar close to its distal margin

Maximum standard length. 54.0 mm.

Biological data. Rheophilic species, occurring in the riffles areas of the streams ( Bockmann et al., 2004). Feeds on aquatic insects in the dry season and on fish scales or fin rays in the wet season; first gonadal maturation size 37.7 mm SL in females and 31.8 mm SL in males ( Casatti, 2003).

Distribution. Córrego São Carlos and córrego São Pedro, tributaries of the rio Paranapanema, and rio Iguatemi, tributary of the rio Paraná.

Figures

Fig. 31. a. Microglanis garavelloi, córrego Dourado, tributary of the rio Iguatemi, Japorã, State of Mato Grosso do Sul. b. Pseudopimelodus mangurus, 180.0 mm SL, uncat. c. Rhyacoglanis paranensis, NUP 14877, 42.7 mm SL, rio Curimba, tributary of the rio Ivaí, Umuarama, State of Paraná. d. Scoloplax empousa, NUP 17582, 19.6 mm SL, córrego Guaçu, tributary of the rio Abambai, Itaquirai, State of Mato Grosso do Sul. e. Paravandellia oxyptera, NUP 313, 18.0 mm SL, Itaipu Reservoir, Foz do Iguaçu, State of Paraná. f. Trichomycterus davisi, 80.9 mm SL, uncat. g. Trichomycterus diabolus, NUP 10046, 83.5 mm SL, rio Iguatemi, tributary of the rio Paraná, Sapucaia, Mato Grosso do Sul State.