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The biotransformation of several monoterpenes by the locally isolated unicellular microalga, Oocystis pusilla was investigated. The metabolites were identified by thin layer chromatography and GC/MS. The results showed that O. pusilla had the ability to reduce the C=C double bond in (?)-carvone to yield trans-dihydrocarvone and traces of cis-dihydrocarvone. O. pusilla also converted (?)-limonene to trans-carveol, as the main product, and yielded carvone and trans-limonene oxide. Furthermore, (-)-linalool was converted to trans-furanoid and trans-pyranoid linalool oxide, thymol was converted to thymoquinone, (-)-carveol was converted to carvone and trans-dihydrocarvone, (-)-menthone and (?)-pulegone were converted to menthol, (L)-citronellal was converted to citronellol, and (?)-b-pinene was converted to trans-pinocarveol.

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