capapretum, Brachyplatystoma Lundberg [J. G.] & Akama [A.] 2005:501, Figs. 1, 2, 8 [Copeia 2005 (no. 3); ref. 28312] Rio Tefé sand beach, Lago Mucura, Supiã-Pucu, Tefé, 3°22'S, 64°43'W, Amazonas State, Brazil. Holotype: MZUSP 78481. Paratypes: ANSP 178101 (1), 179218 (1), 179758 (1), 180484 (1); INPA 10302 (2); MZUSP 55516 (2), 78478 [ex MZUSP 5634] (1). Plus many non-type specimens. Type catalog: Ferraris 2007:330 [ref. 29155]. •Valid as Brachyplatystoma capapretum Lundberg & Akama 2005 -- (Ferraris 2007:330 [ref. 29155]). Current status: Valid as Brachyplatystoma capapretum Lundberg & Akama 2005. Pimelodidae. Distribution: Widespread in the Amazon River basin: Brazil and Peru. Habitat: freshwater.

This fish I imported a few years back, about 4"

filamentosus, Pimelodus Lichtenstein [M. H. C.] 1819:60 [Zoologisches Magazin (Wiedemann) 1819, v. 1 (pt 3); ref. 17526] Brazil. Syntypes: ZMB 2973 (1, poor condition). Type catalog: Silfvergrip & Paepke 1997:169 [ref. 24006] with a holotype, Ferraris 2007:330 [ref. 29155] with a holotype. Lundberg & Littmann in Reis et al. 2003:434 [ref. 27061] regard ZMB 2973 as the holotype. •Valid as Brachyplatystoma filamentosum (Lichtenstein 1819) -- (Ortega & Vari 1986:14 [ref. 9708], Burgess 1989:282 [ref. 12860], Cervigón 1992:379 [ref. 23827], Gómez & Chebez 1996:60 [ref. 23791], Le Bail et al. 2000:84 [ref. 24549], Camargo & Isaac 2001:145 [ref. 27639], Ferraris 2003:857 [ref. 26999], Lundberg & Littmann in Reis et al. 2003:434 [ref. 27061], López et al. 2003:60 [ref. 27366], Menni 2004:83 [ref. 28131], Lundberg & Akama 2005:498 [ref. 28312]). Current status: Valid as Brachyplatystoma filamentosum (Lichtenstein 1819). Pimelodidae. Distribution: Amazon and Orinoco River basins and major rivers of Guianas and northeastern Brazil: Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Peru, Suriname and Venezuela. Habitat: freshwater.

The fish below is the true filamentosum, the price is higher than an Asian arowana at this time, and hardly obtainable.  Notice the distribution of spots on the back, rotation of the mouth. Also notice the length and thickness of the barbel.