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) Genus Wickerhamomyces Kurtzman, Robnett & Bas.-Powers (2008)