Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Saccharomycotina O.E. Erikss. & Winka (1997) [monotypic] - budding yeasts
     Class Saccharomycetes O.E. Erikss. & Winka (1997), nom. inval. [monotypic] see Class Saccharomycetes G.Winter (1880)
       Order Saccharomycetales Luerss. (1877)
         Family Phaffomycetaceae Y. Yamada, H. Kawas., Nagats., Mikata & T. Seki (1999)
           1 Genus Barnettozyma Kurtzman, Robnett & Bas.-Powers (2008)
           2 Genus Cyberlindnera Minter (2009)
           3 Genus Phaffomyces Y. Yamada (1997)
           4 Genus Starmera Y. Yamada, Higashi, S. Ando & Mikata (1997)
           5 Genus Wickerhamomyces Kurtzman, Robnett & Bas.-Powers (2008)