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, Argentin... by Oldřich Říčan, Lubomír Piálek, Adriana Almirón, Jorge Casciotta

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Crenicichla ypo (Teleostei: Cichlidae), a new species from the middle Paraná basin in Misiones, Argentina by Jorge Casciotta, Adriana Almirón, Lubomír Piálek, Sergio Gómez, Oldrich Rícan

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First record of Rineloricaria reisi, R. stellata and R. zaina (Siluriformes: Loricariidae) from the Río Uruguay basin in Argentina by Adriana Almiron, Jorge Casciotta, Lubomir Piálek, Federico Ruiz Diaz, Oldrich Říčan

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MtDNA species-level phylogeny and delimitation support significantly underestimated diversity and endemism in the largest Neotropical cichlid genus (Cichlidae: Crenicichla) by Oldřich Říčan, Klára Dragová, Adriana Almirón, Jorge Casciotta, Jens Gottwald, Lubomír Piálek

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First record and supplementary description of Leporinus amae Godoy, 1980 (Characiformes: Anostomidae) from freshwaters in Argentina by Adriana Almirón, Jorge Casciotta, María Bruno, Lubomír Piálek, Klára Doubnerová, Oldřich Říčan

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Patterns of hybridization in a secondary contact zone between two passerine species, the common nightingale Luscinia megarhynchos and the thrush nightingale Luscinia luscinia by Camille Sottas, Jiří Reif, Lubomír Piálek, Manon Poignet, Pavel Kverek, Paweł T. Dolata, Radka Reifová

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