Background Porous species boundaries can be a source of conflicting hypotheses,
particularly when coupled with variable data and/or methodological approaches. Their
impacts can often be magnified when non-model organisms with complex histories of
reticulation are investigated. One such example is the genus Catostomus (Osteichthys,
Catostomidae), a freshwater fish clade with conflicting morphological and mitochondrial
phylogenies. The former is hypothesized as reflecting the presence of admixed genotypes …