Fishes from the Río Alvarado drainage, Upper Río Magdalena Basin, Colombia Albornoz-Garzón, Juan G. Conde-Saldaña, Cristhian C. López-Delgado, Edwin O. García-Melo, Jorge E. Villa-Navarro, Francisco A. Check List 2020 2020-09-18 16 5 1181 1198 [168,312,1894,1918] Actinopterygii Characidae Astyanax Animalia Characiformes 4 1185 Chordata species undetermined   Figure 2D   Material examined.  COLOMBIA• 6, 75.9–101.9 mmSL; Quebrada La Caima; 04°35′45.8″N, 074°56′39.6″W;  374 ma.s.l.;  12 Dec. 2012; Juan G. Albornoz-Garzón, Cristhian C. Conde-Saldañaleg.; CZUT-IC 10369. • 13, 49.9–107.2 mm SL; Quebrada La Caima; 04°35′45.8″N, 074°56′39.6″W; 374 ma.s.l.; 4 Apr. 2013; Juan G. Albornoz-Garzón, Cristhian C. Conde-Saldaña leg.; CZUT-IC10555.  Identification.Lateral line with 39–43 pored scales. Anal fin with 24–27 branched rays. Caudal fin with up- per lower lobe longer than upper lobe. Body coloration silvery, with greenish tone on dorsal region of head and humeral region. Dark humeral blotch, vertically elon- gated. Dorsal-fin rays yellow. Pectoral and pelvic-fin rays hyaline. Anteriormost anal-fin rays reddish, with distal tips white. Caudal-fin rays reddish with yellow to light green tone. Adipose fin greenish. 2012-12-12 Juan G. Albornoz-Garzon & Cristhian C. Conde-Saldana Colombia 374 4.5960555 Quebrada La Caima 1 -74.944336 4 1185 CZUT-IC 10369 1