Fig. 31

Body deep; greatest depth contained 4.2 to 5.1 and caudal peduncle 9.6 to 10.6 times in SL; head length 2.9 to 3.2, anal-fin base length 7.6 to 9.9, adipose-fin base length 4.2 to 5.2 and maxillary-barbel length 3.2 to 4.6 in SL; snout length 2.4 to 2.9, horizontal orbital diameter 6.2 to 9.4 and least interobital width 3.1 to 3.3 in HL. Mouth terminal, tooth plates on maxilla and dentary. Dorsal fin with I,6, pectoral fin with I,6, pelvic fin with 6 rays and anal fin with 8 or 9 rays. Ground color pale yellow; dorsal and lateral surfaces of head grey, with light-beige blotch on cheek; four dark-brown transverse bars on flank, one from occipital process to lateral line, one below dorsal-fin, one below adipose fin and another on posterior portion of caudal peduncle. Dorsal fin dark-brown, with distal margin hyaline (occasionally, hyaline blotch on middle of last ray); pectoral and pelvic fins with one dark-brown stripe across middle; anal fin with two dark-brown stripes, one at base, other past middle; caudal fin with dark-brown transverse bar past middle, united with dark-brown transverse bar posterior portion of caudal peduncle and caudal-fin base by thin stripe along median caudal-fin rays, demarcating one rounded light-beige blotch on each caudal-fin lobe.

Maximum standard length. 42.0 mm.

Distribution. Upper rio Paraná basin.

Remarks. Rhyacoglanis paranensis has been captured in the rio Iguatemi, right bank of the upper rio Paraná, since 2008 by V. F. B. Silva and collaborators. Shibatta, Vari (2017) described the new genus with a new species from the upper rio Paraná basin.