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Yeasts associated with the curculionid beetle Xyloterinus politus; Candida xyloterini sp. nov., Candida palmyrensis sp. nov., and three common ambrosia yeasts

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¹ E-mail: ssuh{at}atcc.org

Seven yeast strains were isolated from the body surface and galleries of Xyloterinus politus, the ambrosia beetle which attacks black oak trees. Based on rDNA sequence comparisons and other taxonomic characteristics, five of the strains were identified as Saccharomycopsis microspora, Wickerhamomyces hampshirensis, and Candida mycetangii, which have been reported as insect associates previously. The remaining two yeast strains were proposed as novel species, Candida xyloterini sp. nov. (ATCC 62898T = CBS 11547T) and Candida palmyrensis (ATCC 62899T = CBS 11546T). Candida xyloterini is a close sister taxon to Ogataea dorogensis, and assimilates methanol as a sole carbon source but lacks ascospores. On the other hand, C. palmyrensis is phylogenetically distinct from any other ambrosia yeasts reported so far. The species was placed near Candida sophiae-reginae and C. beechii from DNA sequence analyses but neither of the two were close sister taxa to C. palmyrensis.