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 Saccharomycetaceae G.Winter (1881) Genus Tetrapisispora Ueda-Nishim. & Mikata (1999)