Pseudoplatystoma tigrinum (Valenciennes, 1840) (Figure 12, Table 2) Platystoma truncatum Six & Agassiz, 1829: 27, pl. 13a. Type locality: Brazil, Japer and Solomon. Lundberg & Littmann (2003) considered this name to be a senior synonym of P. tigrinum, based on the original description, plate, and locality. These authors retained the younger name P. tigrinum for purposes of stability. There has been virtually no use of P. truncatum since its original description, and it is treated here as a nomen oblitum (sensu Lundberg & Littmann, 2003). Platystoma tigrinum Valenciennes in Cuvier & Valenciennes, 1840:10 [8 of Strasbourg Deluxe ed.], pl. 422. Type locality: Brazil. Holotype: MNHN A. 9354, (mounted and stuffed). Platystoma punctatum Valenciennes in Cuvier & Valenciennes, 1840: 20 [15 of Strasbourg Deluxe ed.]. Type locality: unknown. Geographic distribution: Amazon River, Brazil, Colombia, Ecuador, Perú, and Venezuela (Fig. 11). Type locality: Amazon River, no precise location Material examined: MNHN A-9354, (holotype), 900 mm SL, Amazon River, Brazil, Geoffroy Saint-Hilaire, 1840. ANSP 103927, (1), Iquitos market, 3°46'00"S, 73°15'00"W, Amazon River, department of Loreto, Perú, E. Hugghins, 19 June 1968. ANSP 138995, (1), Marañon River, near Iquitos within one mile of central station, Amazon drainage, department of Loreto, Perú, Catherwood Expedition, October 1955. CAS 133400, (1), Amazon River, Peru. CAS 136185, (1), Amazon River. CAS 6379, (1), Negro River, near Manaus, Amazon River, state of Amazonas, Brazil, W. J. Holl. CAS 78413, (1), Santarem market, Amazon River, state of Para, Brazil, C. Ternetz, September 1924. CAS 18290, (1), mouth of Pacaya drainage near Bretaña, Amazon River, department of Loreto, Peru, F. M. Anderson, 1915. INHS 43959, (1), Pampa Chica, 4.54 km W center of Iquitos, bearing, 3°45'08"S, 73°17'0.1"W, Nanay River, Amazon River, department of Loreto, Perú, M. H. Sabaj et al., 27 July 1997. INHS 54783, (1), Oxbow lake, floodplain along S bank of the Marañon River due S of Nauta, 4°30.6'S, 73°34.1'W, department of Loreto Perú, M. H. Sabaj et al., 4 August 1999. MCP 21028, (4), lago marginal of the Amazon River, Ilha de São Miguel, 1°56'S, 54°44'W, Brazil, R B. Oliveira, 26 November 1997. SIUC 39756, (1), Marañon River, Cocha (Oxbow lake) on the floodplain along the south bank of the Marañon River, 4º30.6'S, 73º34.1'W, department of Loreto, Perú, M. H. Sabaj et al., 4 August 1999. SIUC 26721, (1), mercado Belén in Iquitos, Loreto, Perú. SIUC 39299, (3 ds), purchased in mercado Belén in Iquitos, department of Loreto, Perú, J. G. Stewart, July 1999. SIUC 50354, (9 ds), mercado Belén in Iquitos, department of Loreto, Perú, J.G. Stewart, July - August 2001. SIUC 42551, (1), Playa Pampachica, barrio of Iquitos, 3º45'31"S, 73º16'W, Nanay River, Amazon River, department of Loreto, Perú, J. G. Stewart et al., 7 August 1999. SIUC 26892, (2), old channel of the Ucayali River, Amazon River, mercado Nauta, captured ca. 20 km E, department of Loreto, Perú, B M. Burr et al., 13 July 1994. USNM 306825, (1), Ressaca Da Ilha de Marchantaria, Amazon River, Brazil, P. Bayley, 19 Sept. 1978. Diagnosis: A species of Pseudoplatystoma distinguished by a combination of the following features: presence of loop-like bands connecting to, or extending to, dorsal region and continuing onto other side of body; loop-like bars form cells as noted in the original description (Cuvier & Valenciennes, 1840). This unique feature allowed for the specific epithet of "tigrinum" because of the evident resemblance to the "Royal Tiger" (see Cuvier & Valenciennes 1840, p. 11); adipose fin with small spots and some loop -like bands; no discrete dark spots on side of body. Description: Maximum size recorded 1300 mm TL. Head moderately narrow with a long fontanel extending from mesethmoid to supraoccipital. Body widest measurement at origin of dorsal fin. Loops covering sides and top of body and not extending beyond middle lateral region of body. No spots, straight or loop - like bars on dorsal region of head. Pigmentation on ventral region of body ranging from whitish to yellowish. Spots on dorsal fin rays relatively larger than other species. Spots on the caudal fin more numerous (50-60 in P. tigrinum, 21-45 in P. punctifer; Figs. 13 and 14). Additional differences are described and compared with the other species in Table 9. Color and pattern of adults are shown in Fig. 15.

Published as part of Uriel Angel Buitrago-Suárez & Brooks M. Burr, 2007, Taxonomy of the catfish genus Pseudoplatystoma Bleeker (Siluriformes: Pimelodidae) with recognition of eight species., pp. 1-38 in Zootaxa 1512 on pages 11-14