Loaches of the genus Sabanejewia are model organisms for many ichthyologic studies focusing on morphological and colour variation. The bright lateral spots—a part of the mimicry of this fish—cause a taxonomic puzzle. Common practice is that morphometric and molecular studies lack habitat assessments of species originating from different environments. In this study, we analysed body shape and colour variation within two species...

This study represents a thorough analysis of Codoma, a monotypic genus endemic to north‐western Mexico. A previous morphological analysis of the species concluded that there exists several morphological groups in Codoma ornata , suggesting diversity in Codoma could be underestimated. No studies have examined the genetic diversity in Codoma ornata to test this hypothesis and identify independent lineages. We present a phylogeog...

We assessed the genetic variability of the S iberian spined loach C obitis melanoleuca across its unusually broad distribution that encompasses areas greatly affected by P leistocene glaciations. Due to extensive morphological variation among their populations, the taxonomic status of C . melanoleuca is complicated. It is unclear whether C . melanoleuca represents a single taxonomic unit or contains several species or subspeci...