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 Heptapteridae undescribed Figure 3D Material examined. COLOMBIA • 3, 44.3–62.0 mm SL; Río Alvarado-Puente ; 04°31′11.3″N , 074°59′14.0″W ; 521 m a.s.l. ; 12 Dec. 2012 ; Cristhian C. Conde-Saldaña , Juan G. Albornoz-Garzón leg.; CZUT-IC 10417 . • 2, 40.9– 42.4 mm SL; Río Alvarado-Chucuní ; 04°27′56.7″N , Figure 3. Siluriform fishes from Río Alvarado drainage, Upper Río Magdalena Basin, Colombia. A. Cetopsorhamdia molinae . B. Pimelodella floridablancaensis . C. Rhamdia guatemalensis . D. Heptapteridae undescribed. E. Pimelodus yuma . F. Trichomycterus banneaui . G. Trichomycterus transandianus . H. Trichomycterus mogotensis I. Chaetostoma milesi . J. Chaetostoma thomsoni . K. Hypostomus ( Cochliodon ) hondae . L. Lasiancistrus caucanus . Scale bars: 10 mm. 075°03′46.7″W ; 697 m a.s.l.; 13 Dec. 2012 ; Cristhian C. Conde-Saldaña, Juan G. Albornoz-Garzón leg.; CZUT- IC 10452. Identification. Body moderately elongated. Body deep (9.2–16.6% SL). Cleithral width: 14.0–18.8% SL. Head length: 18.4–22.1% SL. Maxillary barbel reaching pec- toral-fin insertion. Adipose fin rounded (17.6–30.2% SL, its origin anterior to anal-fin; adipose-fin origin equi- distant between dorsal and caudal fins). Adipose-fin depth (2.2–4.6% SL). Caudal fin forked with both lobes rounded, upper lobe longer than lower lobe. Body brown with scattered minute melanophores along body. A conspicuous pale collar around posterior region of head and pale blotch in front of dorsal fin. Fins hyaline.