Pyrrhulina australis Eigenmann, Kennedy, 1903

Fig. 14

Body elongated; greatest body depth contained 4.3 to 4.6 and caudal peduncle depth 7.6 to 10.0 times in SL; head length 3.7 to 4.1, predorsal distance 1.5 to 1.7 and caudal peduncle length 5.5 to 6.3 in SL; snout length 3.1 to 3.7, horizontal orbital diameter 2.6 to 2.9 and least interorbital width 2.6 to 2.7 in HL. Mouth terminal; inner row of premaxilla with 9-12, outer row with 4-6, inner row of dentary with 8-12, outer row with 4-5 and maxilla with 1 or 2 teeth. Longitudinal series with 20-25 scales; transverse series with 6-8 scale rows. Dorsal fin with 9 or 10, pectoral fin with 11 or 12, pelvic fin with 9 or 10, anal fin with 10 or 11 and caudal fin with 19 rays. Ground color pale brown; darkbrown longitunal stripe, from anterior portion of dentary, through orbit, to opercle. Yellowish fins; black irregular blotch on dorsal fin. Some specimens can present few or several black blotches on body (Graça, Pavanelli, 2007).

Maximum standard length. 33.0 mm (Graça, Pavanelli, 2007).

Distribution. Río de la Plata and rio Guaporé basins.