Abstract
The genus Hisonotus was described by Eigenmann & Eigenmann, 1889 and has long been considered junior synonym of Otocinclus and/or Microlepidogaster. After its revalidation, many new species were described and currently Hisonotus is the most specious genus within the Hypoptopomatinae, with 28 valid species. Many studies have included Hisonotus species in phylogenetic analysis, but neither …