Diapoma pyrrhopteryx, Menezes & Weitzman, 2011

Almirón, Adriana, Casciotta, Jorge, Říčanová, Štěpánka, Dragová, Klára, Piálek, Lubomir & Říčan, Oldřich, 2016, First record of Diapoma pyrrhopteryx Menezes & Weitzman, 2011 (Characiformes: Characidae) from freshwaters of Argentina., Ichthyological Contributions of PecesCriollos 40, pp. 1-3 : 2

Diapoma pyrrhopteryx . Morphometric data are given in Table 1 .

According to Menezes & Weitzman (2011) and the specimens analyzed herein, Diapoma pyrrhopteryx is distinguished from its congeners known from Argentina by the presence of a posterior bony expansion of the opercular and subopercular bones; males with adipose fin; upper portion of dorsal and caudal fins, posterior portion of pelvic fins, and ventral portion of anal-fin anterior lobe red in live specimens. The only specimen with red fins collected in the arroyo Toro presented some differences with respect to the description mentioned above ( fig. 2 ).

The following values of meristic characters were counted in the specimens analyzed: dorsal-fin rays 2i,8; anal-fin rays 4i,24-27; pectoral-fin rays i,11; pelvic-fin rays i,6; lateral line scales incomplete with perforated scales in the anterior segment 11-14 followed by 8-10 non-perforated scales and a last segment with 13-16 perforated scales; lateral series scales 36-37, and scales between dorsal-fin origin and anal-fin origin 10-12.

All specimens discussed herein were collected in the río Uruguay basin, arroyo Toro, affluent of the río Pepirí Guazú, above the Moconá falls ( figs. 1 , 3).

Material examined:

MLP 10915 , 4 specimens, 1 c&s; 51.9-53.1 mm SL; Argentina, río Uruguay basin, arroyo Toro , 26°36’32.8”S – 53°44’13.9”W.; coll. Casciotta et al. 19.Feb.2012

Figures

fig. 2. Diapoma pyrrhopteryx, upon capture, MLP 10915, male, arroyo Toro

fig. 1. arroyo Toro (dot) and Moconá/Yucumá falls (star)