title: Multigene phylogenetic analysis of the Trichomonascus, Wickerhamiella and Zygoascus yeast clades, and the proposal of Sugiyamaella gen. nov. and 14 new species combinations.
abstract: Relationships among species assigned to the ascosporic yeast genera Sporopachydermia, Stephanoascus, Trichomonascus, Wickerhamiella and Zygoascus, and to the associated anamorphic genera Arxula, Blastobotrys, Sympodiomyces and Trigonopsis, were determined from phylogenetic analyses of gene sequences from the nearly complete large-subunit rRNA gene, the mitochondrial small-subunit rRNA gene, and cytochrome oxidase II. The genus Stephanoascus is polyphyletic, resulting in reassignment of two species to the older genus Trichomonascus and the third to Sugiyamaella gen. nov. (type species Sugiyamaella smithiae). The genera Sporopachydermia, Wickerhamiella and Zygoascus appear to be monophyletic. The species Pichia ofunaensis and P. tannicola are proposed for transfer to Zygoascus. Arxula, Blastobotrys and Sympodiomyces are members of the Trichomonascus clade, with the genus Blastobotrys having taxonomic priority for anamorphic states. Trigonopsis variabilis and three species of Candida represent a distinct clade. From the foregoing gene sequence analyses, the new ascosporic genus Sugiyamaella is proposed, as are 14 new species combinations and the new family Trichomonascaceae.
authors.affiliation: Microbial Genomics and Bioprocessing Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, US Department of Agriculture, Peoria, IL 61604, USA. kurtzman@ncaur.usda.gov
authors.forename: Cletus P
authors.initials: CP
authors.lastname: Kurtzman
authors.forename: Christie J
authors.initials: CJ
authors.lastname: Robnett
mesh_terms: D003576:Electron Transport Complex IV / Q000235:genetics*; D005656:Fungal Proteins / Q000235:genetics* / Q000378:metabolism; D020459:Genes, rRNA; D008969:Molecular Sequence Data; D016533:Mycological Typing Techniques; D010641:Phenotype; D010802:Phylogeny; D012335:RNA, Ribosomal / Q000235:genetics*; D004718:Saccharomycetales / Q000145:classification* / Q000235:genetics* / Q000254:growth & development; D017422:Sequence Analysis, DNA; D013045:Species Specificity
chemical_list: D005656:Fungal Proteins; D012335:RNA, Ribosomal; D003576:Electron Transport Complex IV