| Summary: | 碩士 === 國立臺灣師範大學 === 生物研究所 === 87 === Thraustochytrids are non-photosynthetic marine protists, belonging to chromists. They display an obligate sodium requirement, so they are widely distributing in the ocean, estuary, inland salt lakes and the mangroves. The thalli of thraustochytrids are similar to the monocentric chytrids. Thrausto-chytrids have biflagellate zoospores and non-flagellate aplanospores. They are saprophytic on algae and phanerogamic detritus and parasitic on invertebrate. In the asexual reproduction, the thallus includes the sporangium and the ectoplasmic net. So far, no sexual reproduction have been documented in any thraustochytrids.
Ththraustochytrids are isolated from the soil and water samples collected in the north coast of Taiwan by using pine pollen grains (Pinus taiwanensis). All isolates were successively transferred by streaking on the KMV agar medium containing antibiotics until the cultures were purified. Then transferred the thraustochytrids on the KMV agar medium and in pollen seawater. In such culture conditions, observation and discription of their morphological characteristics were made.
Totally, three genera and nine species are successfully examined and identified namely: five species of Thraustochytrium : T. motivum、T. antarcticum 、T. proliferum 、T. kinnei、T. aggregatum；two species of Ulkenia：U. visurgensis 、U. radiata；two species of Shizochytrium： S. octosporum 、S. mangrovei. Among them, T. antarcticum、T. kinnei、U. visurgensis、U. radiata、 S. octosporum and S. mangroveiare are described as new records to Taiwan.
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