A new species of Cynopotamus Valenciennes, 1849 (Characiformes, Characidae) with a key to the species of the genus. Author Naércio A. Menezes text Zootaxa 2007 1635 55 61 http://www.zoobank.org/urn:lsid:zoobank.org:pub:F1A8B580-6FEF-40F0-BE7D-68CA04F3A07B journal article z01635p055 F1A8B580-6FEF-40F0-BE7D-68CA04F3A07B [[ Animalia Characiformes Characidae Cynopotamus genus Cynopotamus Valenciennes ]] Key to species of Animalia Characiformes Characidae Cynopotamus genus Cynopotamus 1a. Dorsal-fin rays ii,10 (Paraguay, lower Paraná and Uruguay river basins)................................ Animalia Characiformes Characidae Cynopotamus argenteus species 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)................................................................................... Animalia Characiformes Characidae Cynopotamus juruenae species C. juruenae 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) .... Animalia Characiformes Characidae Cynopotamus essequibensis species C. essequibensis 4b. Developed gill-rakers on first branchial arch 10-11; branched anal-fin rays 39-45 (rio Xingu basin, Mato Grosso and Pará, Brazil)............................................................................................................. Animalia Characiformes Characidae Cynopotamus xinguano species 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)......................................................................................................... Animalia Characiformes Characidae Cynopotamus tocantinensis species C. tocantinensis 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) .... Animalia Characiformes Characidae Cynopotamus magdalenae species C. magdalenae 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)............................................... Animalia Characiformes Characidae Cynopotamus bipunctatus species C. bipunctatus 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)................................................................................................. Animalia Characiformes Characidae Cynopotamus gouldingi species C. gouldingi 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) ... Animalia Characiformes Characidae Cynopotamus amazonus species 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)......................................................................... Animalia Characiformes Characidae Cynopotamus kincaidi species 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)...................................................................................................................... Animalia Characiformes Characidae Cynopotamus atratoensis species C. atratoensis 11b. Horizontal scale rows from anal-fin origin to lateral line 25-28; branched anal-fin rays 40-46 (Maracaibo basin, Venezuela)..................................................................................................................... Animalia Characiformes Characidae Cynopotamus venezuelae species C. venezuelae