Cyst morphology of a chain-forming unarmored dinoflagellate Gyrodinium impudicum Fraga et Bravo |
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| Authors: | Satoru Kobayashi Natsuhiko Kojima Shigeru Itakura Ichirou Imai Kazumi Matsuoka |
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| Institution: | Tokyo Kyuei Co. Ltd., Technical Center, 6906–10 Shiba-tsurugamaru, Kawaguchi, 333–0865, Japan;Laboratory of Biology, Osaka Institute of Technology, Ohmiya, Asahi-ku, Osaka 535–8585, Japan;National Research Institute of Fisheries and Environment of Inland Sea, Ohno-cho, Saeki-gun, Hiroshima 739–0452, Japan;Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606–8502, Japan;Faculty of Fisheries, Nagasaki University, 1–14 Bunkyo-cho, Nagasaki 852–8521, Japan |
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| Abstract: | Cysts of a chain‐forming dinoflagellate Gyrodinium impudicum Fraga et Bravo (Gymnodiniales) were found in surface sediments of Harima‐Nada and Nakaumi, western Japan. The detailed morphology of living and empty cysts is described. The living cysts are roundish to ellipsoidal in polar view, and hemispherical in lateral view. Among three empty cysts obtained, two different archeopyles were observed; either a long slit with an operculum, or a hole with irregular zigzag outline. The living cysts of Gyro. impudicum are morphologically similar to those of the genus Chattonella antiqua (Hada) Ono and Chattonella marina (Subrahmanyan) Y. Hara et Chihara (Raphidophyceae), except cyst color and contents. The living cysts of Gyro. impudicum were rarely encountered, and their density was always less than 1 cell in 1 cm?3 in the present samples. |
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| Keywords: | archeopyle cyst dinoflagellate Gymnodiniales Gyrodinium impudicum |
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