Curculionichthys insperatus (Britski, Garavello, 2003)

Fig. 27

Body elongated; greatest depth contained 5.2 to 6.9 times in SL; head length 3.1 to 3.9, pectoral-fin length 3.7 and pelvic-fin length 4.9 to 6.1 in SL; snout length 1.4 to 1.6, horizontal orbital diameter 4.8 to 6.7 and least interorbital width 2.0 to 2.4 in HL. Mouth inferior; premaxilla with 10-12 and dentary with 8-11 teeth. Longitudinal series with 24 plates. Dorsal fin with I,7 rays, pectoral fin with I,6, pelvic fin with 6 rays and anal fin with I,5 rays (Britski, Garavello, 2003). Ground color yellowish to pale brown; dark-brown longitudinal band, from tip of snout to median caudal-fin rays; three dark-brown transverse bars on dorsum posteriorly to dorsal fin. Hyaline fins; dorsal fin with scattered spots; caudal fin with superior and inferior margins dark-brown; dark-brown transverse stripes on distal third of both upper and lower caudal-fin lobes, their margins hyaline.

Maximum standard length. 30.2 mm.

Biological data. Lives in streams with banks covered by terrestrial vegetation partially submerged into the water; in males the urogenital papilla is conspicuous and immediately posterior to the anal opening, whereas in females the urogenital duct is opened into the cloacal cavity (Britski, Garavello, 2003).

Distribution. Upper rio Paraná basin.