Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
     Infraclass Neoaves Sibley et al., 1988 see Subcohort Neoaves Sibley et al., 1988
       Parvclass Picae (C. Linnaeus, 1758) see Order Piciformes Meyer & Wolf, 1810
         Order Piciformes Meyer & Wolf, 1810 - scansorial birds
           Infraorder Ramphastides see Superfamily Ramphastoidea Vigors, 1825
             Superfamily Lybioidea see Superfamily Ramphastoidea Vigors, 1825
               Family Lybiidae Sibley & Ahlquist, 1985 - African barbets see Subfamily Lybiinae del Hoyo et al., 2014
                 Genus Trachyphonus Ranzani, 1821
                   1 Trachyphonus purpuratus Verreaux & Verreaux, 1851 - yellow-billed barbet see Trachylaemus purpuratus (J. Verreaux & E. Verreaux, 1851)
                   2 Trachyphonus vaillantii Ranzani, 1821 - crested barbet
                   3 Trachyphonus margaritatus (Cretzschmar, 1826) - yellow-breasted barbet
                   4 Trachyphonus erythrocephalus Cabanis, 1878 - red-and-yellow barbet
                   5 Trachyphonus darnaudii (Prévost & Des Murs, 1847) - d'Arnaud's barbet
                   6 Trachyphonus usambiro Neumann, 1908 - Usambiro barbet see Trachyphonus darnaudii usambiro Neumann, 1908