Nine strains of
Arxula, Stephanoascus, Endomyces, Yarrowia, Dipodascus, and
Geot richum were examined regarding the partial sequences of 18S and 26S rRNAs. In the positions 471 through 627 of 26S rRNA, the two strains examined of the genera
Arxula and
Stephanoascus had 99% and 98% maximum homologies, respectively. The two species of the genus
Arxula, A. terrestris and
A. adeninivorans had 80% maximum homology. The maximum homologies were 81-84% between the genera
Arxula and
Stephanoascus. Arxula, Endomyces, Yarrowia, Dipodascus, Geotrichum, and
Saccharomyces species constituted their own separate clusters at 49-76% maximum homologies. In the positions 1685 through 1835 of 26S rRNA, the two strains examined of the genera
Arxula and
Stephanoascus had 2 and 0 base difference, respectively. The two species of the genus
Arxula had 7-9 base differences. The base differences were 4-8 between the genera
Arxula and
Stephanoascus. Arxula, Endomyces, Yarrowia, Dipodascus, Geotrichum, and
Saccharomyces species constituted their own separate clusters at 13-25 base differences. In the positions 1451 through 1618 of 18S rRNA, the two strains examined of the genera
Arxula and
Stephanoascus had no base difference, respectively. The two species of the genus
Arxula had 2 base differences. The base differences were 2-4 between the genera
Arxula and
Stephanoascus. Arxula, Endomyces, Yarrowia, Dipodascus, Geotrichum, and
Saccharomyces species constituted their own separate clusters at 5-9 base differences. The data obtained are discussed from the taxonomic and phylogenetic points of view.
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