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 Trigonopsidaceae Lachance & C.P Kurtzman (2013)
           1 Genus Botryozyma Shann & M.T. Sm. (1992)
           2 Genus Tortispora Lachance & Kurtzman (2013)
           3 Genus Trigonopsis Schachner (1929)