Lundberg & Dahdul, 2008 : 447 Lundberg & Dahdul, 2008 : 450 Illustrated and online catalog of type specimens of freshwater fishes in the Colección de Peces Dulceacuícolas of Instituto de Investigación de Recursos Biológicos Alexander von Humboldt (IAvH-P), Colombia Donascimiento, Carlos Cárdenas-Bautista, Johann-Stephens Acosta, Kevin Giancarlo Borja González-Alvarado, Arturo Medina, Claudia A. Zootaxa 2016 4171 3 401 438 625M5 30998 [151,306,1793,1819] Actinopterygii Pimelodidae Animalia Siluriformes 12 413 Chordata family     Megalonema amaxanthum  Lundberg & Dahdul, 2008: 447, fig. 6.   Paratypes( Fig. 26). IAvH-P 11020 (14, 30.0–54.0 mm SL). Brazil, Pará,  Amazon RiverBasin, rio Tocantinsabove rio Pará, collected with  3 mbottom trawl in  3–5 mchannel, 02°24’17.5”S 49°27’55.5”W; J. Lundberg et al.,  19 Nov 1994.  Remarks: received from M. Sabaj Pérez, formerly ANSP 189096, in part.     Megalonema orixanthum  Lundberg & Dahdul, 2008: 450, fig. 7. Paratypes ( Fig. 27). IAvH-P 11021 (2, 94.0– 96.5 mmSL).  Colombia, Meta,  Orinoco RiverBasin, río Metadrainage, río Metica, ca.  3 kmSE of Hacienda Mozambique, 03°57’N 73°02’W; J. Böhlke et al.,  24 Mar 1975. Remarks: collected with holotype; received from M. Sabaj Pérez, formerly  ANSP148143, in part. 1315932808 1994-11-19 J. Lundberg Brazil Amazon River Basin 3 -2.4048612 River Basin 1 -49.465416 Amazon River 12 413 1 Para paratype 1315932809 1975-03-24 ANSP J. Bohlke & Remarks & M. Sabaj Perez Colombia Orinoco River Basin 3.95 River Basin 1307 -73.03333 Orinoco River 13 414 ANSP 148143 1 Meta holotype