Multilocus phylogeny of Crenicichla (Teleostei: Cichlidae), with biogeography of the C. lacustris group: Species flocks as a model for sympatric speciation in rivers

► Multilocus phylogeny of Crenicichla with relationships among species groups. ► Species groups: lacustris, lugubris, reticulata, saxatilis, wallacii, Teleocichla. ► Large-scale biogeography of Crenicichla lacustris group predominantly vicariant. ► Middle Paraná River species complex of C. lacustris group is a new species flock. ► Species flocks as models to study sympatric speciation in rivers.