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 Trichomonascaceae Kurtzman & Robnett (2007)
           01 Genus Blastobotrys Klopotek (1967)
           02 Genus Deakozyma C.P. Kurtzman & C.J. Robnett (2014)
           03 Genus Diddensiella G. Péter, Dlauchy & Kurtzman (2012)
           04 Genus Groenewaldozyma C.P. Kurtzman (2016)
           05 Genus Middelhovenomyces C.P. Kurtzman & C.J. Robnett (2014)
           06 Genus Nadsonia Syd. (1912)
           07 Genus Spencermartinsiella G. Péter, Dlauchy, Tornai-Leh., M. Suzuki & Kurtzman (2011)
           08 Genus Starmerella C.A. Rosa & Lachance (1998)
           09 Genus Sugiyamaella Kurtzman & Robnett (2007)
           10 Genus Wickerhamiella Van der Walt (1973)
           11 Genus Yarrowia Van der Walt & Arx (1981)
           12 Genus Zygoascus M.T. Sm. (1986)