Scoloplax empousa Schaefer, Weitzman, Britski, 1989

Fig. 31

Body depressed anteriorly, compressed posteriorly; greatest depth contained 5.7 to 6.8 times in SL; head length 3.7 to 4.2, pectoral fin length 4.0 to 4.2 and pelvic fin length 4.7 to 5.5 in SL; snout length 3.4 to 5.1 and least interorbital width 2.9 to 3.6 in HL. Mouth inferior, premaxilla and dentary with several small teeth. Dorsal fin with I,4, pectoral fin with I,5, pelvic fin with I,3 or 4 and anal fin with 6 rays (Britski et al., 2007). Ground color dark-brown, darker dorsally, lighter ventrally. Caudal-fin base with dark-brown blotch, followed by light-beige area alternating with dark-brown area; pelvic fin with dark-brown spots; dorsal, pectoral and anal fins irregularly spotted, with light-beige areas alternating with dark-brown areas (Graça, Pavanelli, 2007).

Maximum standard length. 24.0 mm (Graça, Pavanelli, 2007).

Distribution. Amazon basin and Paraná-Paraguay system.