Cheirodon kriegi Schindler, 1937 Serrapinnus kriegi ( Schindler, 1937 ) Serrapinnus sp. First record of Serrapinnus kriegi (Schindler, 1937) and confirmed presence of S. calliurus (Boulenger, 1900) for Uruguay (Characiformes: Characidae) Serra, Wilson S. Scarabino, Fabrizio Paullier, Sofía Ichthyological Contributions of PecesCriollos 2018 2018-07-22 59 1 6 4WX9K (Schindler, 1937) Schindler 1937 [189,644,880,904] Characidae Serrapinnus Animalia Characiformes 3 4 Chordata species kriegi  o  Cheirodon kriegi Schindler, 1937*: 106 [description] o  Serrapinnus kriegi( Schindler, 1937): Malabarba, 1998*: 215 [new combination]; Miquelarena et al.,2008*: 74 [identification key, redescription and distribution]; Mantinian, 2011*: 50, 84 [identification key, redescription, pictures and distribution] o  Serrapinnussp.(partim): Loureiro et al., 2013: 104, 110 [species list and conservation]   Examined material (12 lots): MHNM 3560, 7 ex., 18,5-23,4 mmSL, Paso de León( 30º08'12,11''S; 27º06'14,73''W), Cuareim River, Artigas Department, Uruguay, col.: W.S. Serra, M. Zarucki, M. Loureiro& D. Arrieta,  22/III/2014.  MHNM 3794, 1 ex., 21,0 mm SL, Paso de la Cruz( 30°16'19.50"S; 57°19'12.72"W), Cuareim River, Artigas Department, Uruguay, col.: W.S. Serra, M. Loureiro, F. Teixeira de Mello, S. Villars, D. Olsson, N. Zaldúa& F. Stábile,  26-27/IX/2015.  MHNM 4004, 3 ex., 12,3-19,9 mmSL (fixed in 95% Ethanol), pond near Uruguay River( 31°04'19,98"S; 57°51'32,83"W), Villa Constitución, Salto Department, Uruguay, col.: W.S. Serra& J. Chocca,  20/IV/2017.  MHNM 4006, 7 ex., 11,4-21,1 mmSL (fixed in 95% Ethanol), Rincón de Franquia( 30°11'45,75"S; 57°37'08,40"W), Bella Unión, Artigas Department, Uruguay, col.: W.S. Serra, R. Foti& J. Chocca,  22/IV/2017.  ZVC-P 10398, 1 ex., 18,8 mmSL, Cañada del Sauzal de la Divisa( 30°19'54,09"S; 57°25'30,08"W), Artigas Department, Uruguay, col.: M. Loureiro, F. Teixeira de Mello, I. González-Bergonzoni& F. Quintans,  III/2007.  ZVC-P 14042, 6 ex., 20,4-23,3 mmSL, Arrocera CONTIin front of Isla del Zapallo( 30°30'00,03"S; 57°51'24,97"W), Uruguay River, Artigas Department, Uruguay, col.: C. Ríos& J. González,  01/VII/1979.  ZVC-P 14188, 6 ex., 17,2-22,7 mmSL (fixed in 95% Ethanol), Franquia( 30°12'34,26"S; 57°37'29,76"W), Bella Unión, Artigas Department, Uruguay, col.: M. Loureiro, J. Bessonart, M. Zarucki& S. Paullier,  18/VIII/2017.  ZVC-P 14189, 3 ex., 17,1-18,1 mmSL (fixed in 95% Ethanol), Laguna Redonda( 30°13'09,38"S; 57°37'20,32"W), Bella Unión, Artigas Department, Uruguay, col.: M. Loureiro, J. Bessonart, M. Zarucki& S. Paullier,  17/VIII/2017.  ZVC-P 14192, 3 ex., 17,6-19,1 mmSL, Laguna Redonda( 30°13'09,38"S; 57°37'20,32"W), Bella Unión, Artigas Department, Uruguay, col.: M. Loureiro, J. Bessonart, M. Zarucki& S. Paullier,  17/VIII/2017.  ZVC-P 14194, 2 ex., 17,9-23,9 mmSL, Franquia( 30°12'34,26"S; 57°37'29,76"W), Bella Unión, Artigas Department, Uruguay, col.: M. Loureiro, J. Bessonart, M. Zarucki& S. Paullier,  18/VIII/2017.  ZVC-P 14196, 1 ex., 21,9 mmSL, Arroyo Yucutujá( 30°20'49,42"S; 57°19'43,00"W), Artigas Department, Uruguay,  II/2006.  ZVC-P 14197, 4 ex., 21,4-22,3 mmSL, Arroyo del Cortado( 30°08'56,34"S; 57°05'55,34"W), Artigas Department, Uruguay, col.: A. Duarte, W.S. Serra& M. Loureiro,  5/XII/2012.  This species differs from other congeners from the La Plata River basin by the following combination of characters: premaxillary teeth with 7-9 cusps, dorsal fin hyaline, incomplete lateral line, abdominal black spot present and procurrent rays of the ventral profile of the caudal peduncle anteriorly curved ( Almirón et al., 2015; Jerep & Malabarba, 2014; Malabarba & Jerep, 2014; Mantinian, 2011; Miquelarena et al., 2008).  Uruguayan specimens present all these characters and come from Artigasand SaltoDepartments, in northern Uruguay, associated to the UruguayRiver and its affluent, the Cuareim River (fig. 3). They were collected in shallow lagoons, canals and wetlands, occasionally forming schools with  S. calliurus. Previously known distribution of  S. kriegiextended through Paraná, Paraguayand Middle Uruguay(Rio Grande do Sul) River basins, in Argentina, Bolivia, Brazil, and Paraguay( Bertaco et al., 2016; Mantinian, 2011; Malabarba, 2003; Miquelarena et al., 2008; Sarmiento et al., 2014). On the basis of material analyzed we confirm the presence of  S. calliurusin shallow lagoons, canals and wetlands mainly in the north of the country. Additionally we record for the first time for Uruguaythe presence of  S. kriegiin the same area and habitats of  S. calliurus, occasionally even forming mixed schools. Fieldwork in other areas of the country suggests that these species are mainly restricted to the area herein reported, matching the distribution of other species as  Apistogramma borellii,  Diapoma alegretense,  Lepthoplosternum pectoralis,  Leporinus lacustris,  Tatia boemia, and  Microglanisaff. eurystoma( Zarucki et al., 2010). The historical presence of both species in Uruguaywas confirmed through material deposited in collections since almost 50 years. This fact reinforces the relevance of scientific collections and the periodic conservation of large lots of "species", that may reveal to be species complexes only lately detected after new analyses. 4879910319 2014-03-22 MHNM W. S. Serra & M. Zarucki & M. Loureiro & D. Arrieta Uruguay -30.136698 Paso de Leon 1 -27.104092 Cuareim River 3 4 MHNM 3560 7 Artigas Department 4879910313 2015-09-26 2015-09-27 2015-09-26 MHNM W. S. Serra & M. Loureiro & F. Teixeira de Mello & S. Villars & D. Olsson & N. Zaldua & F. Stabile Uruguay -30.272083 Paso de la Cruz 1 -57.320198 Stabile 3 4 MHNM 3794 1 Artigas Department 4879910321 2017-04-20 MHNM W. S. Serra & J. Chocca Uruguay -31.072218 Uruguay River 1 -57.85912 3 4 MHNM 4004 3 Salto Department 4879910312 2017-04-22 R W. S. Serra & R. Foti & J. Chocca Uruguay -30.196041 Rincon de Franquia 1 -57.619 Bella Union 3 4 MHNM 4006 7 Artigas Department 4879910309 2007-03 M. Loureiro & F. Teixeira de Mello & I. Gonzalez-Bergonzoni & F. Quintans Uruguay Quintans -30.331692 Canada del Sauzal de la Divisa 1 -57.425022 Gonzalez-Bergonzoni 3 4 ZVC-P 10398 1 Artigas Department 4879910326 1979-07-01 CONTI C. Rios & J. Gonzalez Uruguay -30.500008 Arrocera CONTI 1 -57.856934 3 4 ZVC-P 14042 6 Artigas Department 4879910301 2017-08-18 M. Loureiro & J. Bessonart & M. Zarucki & S. Paullier Uruguay -30.209517 Franquia 1 -57.62493 Bella Union 3 4 ZVC-P 14188 6 Artigas Department 4879910314 2017-08-17 M. Loureiro & J. Bessonart & M. Zarucki & S. Paullier Uruguay -30.219273 Laguna Redonda 1 -57.62231 Bella Union 3 4 ZVC-P 14189 3 Artigas Department 4879910328 2017-08-17 M. Loureiro & J. Bessonart & M. Zarucki & S. Paullier Uruguay -30.219273 Laguna Redonda 1 -57.62231 Bella Union 3 4 ZVC-P 14192 3 Artigas Department 4879910320 2017-08-18 M. Loureiro & J. Bessonart & M. Zarucki & S. Paullier Uruguay -30.209517 Franquia 1 -57.62493 Bella Union 3 4 ZVC-P 14194 2 Artigas Department 4879910307 2006-02 Arroyo Yucutuja Uruguay -30.347061 Arroyo Yucutuja 1 -57.32861 3 4 ZVC-P 14196 1 Artigas Department 4879910327 2012-12-05 A. Duarte & W. S. Serra & M. Loureiro Uruguay -30.148983 Arroyo del Cortado 1 -57.098705 3 4 ZVC-P 14197 4 Artigas Department