Description of two new species forming a sympatric species pair of Crenicichla (Teleostei: Cichlidae) endemic to the Piray Guazú River in the Paraná River Basin, Misiones, Argentina and belonging to the C. mandelburgeri species complex Author Říčan, Oldřich 197D8E32-925D-4A16-8ED1-9E13C74D98D6 University of South Bohemia, Faculty of Science, Department of Zoology, Branišovská 31, 370 05, České Budějovice, Czech Republic. UNLP, Facultad de Ciencias Naturales y Museo, División Zoología Vertebrados, Paseo del Bosque, 1900 La Plata, Buenos Aires Province, Argentina. CIC, Comisión de Investigaciones Científicas de la Provincia de Buenos Aires. oldrich.rican@prf.jcu.cz Author Piálek, Lubomír EC3A7A16-5D8A-435B-86A0-99ABBFCA3D7A University of South Bohemia, Faculty of Science, Department of Zoology, Branišovská 31, 370 05, České Budějovice, Czech Republic. UNLP, Facultad de Ciencias Naturales y Museo, División Zoología Vertebrados, Paseo del Bosque, 1900 La Plata, Buenos Aires Province, Argentina. CIC, Comisión de Investigaciones Científicas de la Provincia de Buenos Aires. lpialek@yahoo.com Author Almirón, Adriana A05615F7-525C-42BE-B781-0C7BC84E6B6C adrialmi9@hotmail.com Author Casciotta, Jorge A05615F7-525C-42BE-B781-0C7BC84E6B6C&5C7A6540-AED1-474E-9878-9E9471EA8286 adrialmi9@hotmail.com&jcasciotta@gmail.com text European Journal of Taxonomy 2023 2023-07-07 879 38 63 http://dx.doi.org/10.5852/ejt.2023.879.2159 journal article 58549 10.5852/ejt.2023.879.2159 a93e54d6-ca64-402f-a2f4-3aced62fc17b 2118-9773 8135480 733CA3B8-E405-4E40-B750-BD1122C45052 Crenicichla lepidota (Heckel, 1840) ARGENTINA1 ex. , 151.6 mm SL; Corrientes , Paraná River Basin , Isla Apipé Grande , Ituzaingó ; MACN-ict 7275 1 ex. , 98.4 mm SL; Formosa , Paraguay River Basin , Riacho de Oro ; MACN-ict 4091 2 ex. , 116.0– 165.7 mm SL; Misiones , Represa Estación Experimental Cerro Azul ; MACN-ict 3656 .