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[[ Cynopotamus Valenciennes ZBK ]]

Key to species of Cynopotamus ZBK

1a. Dorsal-fin rays ii,10 (Paraguay, lower Paraná and Uruguay river basins)................................ C. argenteus

1b. Dorsal-fin rays ii,9 (very rarely ii,10)..........................................................................................................2

2a. Perforated lateral-line scales 85-90; horizontal scale rows from dorsal-fin origin to lateral line 17-18 (upper rio Juruena, Mato Grosso, Brazil)................................................................................... C. juruenae ZBK

2b. Perforated lateral line scales 91-125; horizontal scale rows from dorsal-fin origin to lateral line 20-31.. 3

3a. Horizontal scale rows from anal-fin origin to lateral line 17-21.................................................................4

3b. Horizontal scale rows from anal-fin origin to lateral line 22-30.................................................................5

4a. Developed gill-rakers on first branchial arch 8-9; branched anal-fin rays 36-43 (rivers of Guyana, French Guiana and Surinam and rio Branco basin, Roraima and Araguari basin, Amapá , Brazil) .... C. essequibensis ZBK

4b. Developed gill-rakers on first branchial arch 10-11; branched anal-fin rays 39-45 (rio Xingu basin, Mato Grosso and Pará , Brazil)............................................................................................................. C. xinguano

5a. Horizontal scale rows from dorsal-fin origin to lateral line 23-25 (rio Tocantins and rio Araguaia basins, Goiás and Pará , Brazil)......................................................................................................... C. tocantinensis ZBK

5b. Horizontal scale rows from dorsal-fin origin to lateral line 25-31..............................................................6

6a. Perforated lateral line scales 125 or more; branched anal-fin rays 49-51 (rio Magdalena and rio Cauca basins, Colombia) .... C. magdalenae ZBK

6b. Perforated lateral-line scales 98-121; branched anal-fin rays 36-49..........................................................7

7a. Branched anal-fin rays 47-49 ( río Orinoco basin, Venezuela)............................................... C. bipunctatus ZBK

7b. Branched anal-fin rays 36-47......................................................................................................................8

8a. Horizontal scale rows from dorsal-fin origin to lateral line 29-31; branched anal-fin rays 35-38 (rios Tocantins and Araguaia basins)................................................................................................. C. gouldingi ZBK

8b. Horizontal scale rows from dorsal-fin origin to lateral line 25-29; branched anal-fin rays 36-47.............9

9a. Branched anal-fin rays 36-39 (Peruvian Amazon and tributaries of rio Solimões in Brazil) ... C. amazonus

9b. Branched anal-fin rays 39-47....................................................................................................................10

10a. Perforated lateral-line scales 98-109; branched pectoral-fin rays 13-15; branched anal-fin rays 39-44 (rios Paraguay and lower Paraná basins, Brazil)......................................................................... C. kincaidi

10b. Perforated lateral-line scales 110-121; branched pectoral-fin rays 15-17; branched anal-fin rays 40-47 .. ...................................................................................................................................................................11

11a. Horizontal scale rows from anal-fin origin to lateral line 29-31; branched anal-fin rays 45-47 ( río Atrato basin, Colombia)...................................................................................................................... C. atratoensis

11b. Horizontal scale rows from anal-fin origin to lateral line 25-28; branched anal-fin rays 40-46 (Maracaibo basin, Venezuela)..................................................................................................................... C. venezuelae

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