Holotyp Panaqolus tankei
INPA 41135, 72.8 mm SL, Brazil, Pará, rio Xingu, 17 km south from Senador José Porfírio, main channel, (02°44?54.7?S 52°00?09.5?W), 13 Jul. 2012, L. M. Sousa et al.
Paratypen Panaqolus tankei
USNM 376497, 2, 41.6?50.2 mm SL, 72.5 km below Senador Jose Porfirio, 31.5 km above Porto de Moz (02°01?59.16?S 52°14?53.88?W), 09 Nov. 1994, L. H. Rapp Py-Daniel et al.
Paratypen Panaqolus tankei
INPA 31777, 29 (1 c&s), 26.7?82.8 mm SL, Vitória do Xingu (02°51’36″S 51°59’20″W), 04 Nov. 2008, Rapp Py-Daniel et al.
Paratypen Panaqolus tankei
MZUSP 115040, 5, 36.8?63.3 mm SL, same data as INPA 31777
Paratypen Panaqolus tankei
MNRJ 41741, 7, 33.2?56.5 mm SL, same data as holotype
Paratypen Panaqolus tankei
ANSP 195074, 4, 33.1?78.9 mm SL, rio Xingu, municipality of José Porfírio (02°44?54,7? S 52°0?9,5?W), 13 Jul. 2012, Sousa et al.
Paratypen Panaqolus tankei
MPEG 28832, 3, 40.6?66.9 mm SL, same data as ANSP 195074
Paratypen Panaqolus tankei
INPA 40506, 8, 25.7?69.1 mm SL, rio Xingu, deep channel along right bank of river ca. 38 km southeast of Vitória do Xingu (3°5?32.39?S 51°44?14.1?W), 21 Sep. 2013, Sabaj-Pérez et al.
Paratypen Panaqolus tankei
INPA 40536, 8, 45.5?78.4 mm SL, rio Xingu, along left bank of river ca. 8 km east of Vitória do Xingu (2°53?18.7?S 51°56?24.54?W), 22 Sep. 2013, Sabaj-Pérez et al.
Paratypen Panaqolus tankei
INPA 40562, 17, 23.3?40.0 mm SL, rio Xingu, main channel off downstream point of large island, ca. 13.5 km east-southeast of Vitória do Xingu (2°55?16.39?S 51°53?41.6?W), 22 Sep. 2013, Sabaj-Pérez et al.
Paratypen Panaqolus tankei
INPA 40567, 6, 32.2?74.9 mm SL, rio Xingu, main channel off upstream point of large island, ca. 2.5 km northeast of mouth of igarapé leading to Vitória do Xingu. (2°51?34.2?S 51°58?46.14?W), 22 Sep. 2013, Sabaj-Pérez et al.
Paratypen Panaqolus tankei
INPA 40644, 12, 29.5?83.0 mm SL, rio Xingu, main channel along left bank, ca. 10 km southwest and across river from Senador José Porfírio (2°38?51.5?S 52°1?39?W), 24 Sep. 2013, Sabaj-Pérez et al.