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Phylogenetic Relationships among Species of Sterigmatomyces and Fellomyces as Determined from Partial rRNA Sequences

¹Institut Pasteur, Unité de Mycologie, 75724 Paris Cedex 15, France
²Northern Regional Research Center, Agricultural Research Service, United States Department of Agriculture, Peoria, Illinois 61604

^* Corresponding author.

ABSTRACT

Sequence comparisons of selected regions from small (18S) and large (25S) subunit rRNAs were used to examine species relationships in the anamorphic yeast genera Sterigmatomyces, Fellomyces, Tsuchiyaea, and Kurtzmanomyces. On the basis of sequence similarity, the genus Sterigmatomyces is comprised of Sterigmatomyces halophilus and Sterigmatomyces elviae, while the genus Fellomyces contains three recognized species, Fellomyces fuzhouensis, Fellomyces penicillatus, and Fellomyces polyborus. Tsuchiyaea wingfieldii and Kurtzmanomyces nectairii are well separated from the other species which we examined. Comparisons with selected teleomorphs indicated that the genus Fellomyces is closely related to the genus Sterigmatosporidium, whereas the genus Sterigmatomyces exhibited somewhat closer relatedness with the genus Leucosporidium. Impacting on our estimates of relatedness was the finding that nucleotide substitution in the rRNA regions which we examined seems relatively constant only among closely related species.