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Parallel and non-parallel evolution of ecomorphs in the Uruguay and Paraná River species flocks. Parallel evolution of molluscivores: Crenicichla tesay (a) and C. minuano (b), crevice feeders: C. tuca (c) and C. tendybaguassu (d), and periphyton grazers: C. tapii (e) and C. hadrostigma (f). Non-parallel morphological evolution, but trophic parallelism among piscivores: C. iguassuensis (g), C. missioneira (h), C. sp. Urugua-í line (i) and C. celidochilus (j).
