Fishes from the Río Alvarado drainage, Upper Río Magdalena Basin, Colombia Author Albornoz-Garzón, Juan G. Author Conde-Saldaña, Cristhian C. Author López-Delgado, Edwin O. Author García-Melo, Jorge E. Author Villa-Navarro, Francisco A. text Check List 2020 2020-09-18 16 5 1181 1198 http://dx.doi.org/10.15560/16.5.1181 journal article 10.15560/16.5.1181 1809-127X Rivulus ( Cynodonichthys ) magdalenae Eigenmann & Henn, 1916 Figure 4G Material examined. COLOMBIA • 11, 16.9–45.7 mm SL; Quebrada La Manjarres ; 04°28′19.3″N , 075°04′26.9″W ; 758 m a.s.l. ; 19 Sep. 2012 ; Juan G. Albor- noz-Garzón, Cristhian C. Conde-Saldaña leg.; CZUT-IC 10208 . • 13, 19.9–44.6 mm SL; Quebrada La Manjarres ; 04°28′19.3″N , 075°04′26.9″W ; 758 m a.s.l. ; 12 Dec. 2012 ; Juan G. Albornoz-Garzón , Cristhian C. Conde-Saldaña leg.; CZUT-IC 10439 . Identification. Head scaled, except for cheek. Mouth su- perior. Longitudinal series of scales 40–42. Body col- oration of live males brown, sides of body bluish, from humeral region to caudal peduncle, with a lateral irregular series of red spots. Dorsal and anal fins with red spots on basal half, distal half yellow with thin dark pur- ple band on distal margin. Caudal fin dark purple along procurrent rays, distal portion yellow and white. Pectoral and pelvic fins yellowish. Body coloration of live fe- males brown, with scattered dark blotches along sides. Dorsal and anal fins with dark spots. Pelvic and pectoral fins hyaline. A dark spot on upper portion of caudal pe- duncle ( Henn 1916 ).