Abstract
ABSTRACTA further description of the green dinoflagellate, strain Y‐100, with a chlorophyll a‐ and b‐containing endosymbiont is given with special emphasis on the morphology of the host cell. The host dinoflagellate cell is unarmored and has a gymnodinoid overall appearance. The theca or amphiesma basically consists of the outer membrane and flattened thecal vesicles in which no thecal plates are developed. Unusual hand basket‐shaped scales cover the entire cell surface together with a layer of mucilaginous material. These findings suggest that the organism is a new member of the Gymnodiniaceae (Gymnodiniales). We propose the name Lepidodinium viride gen. et sp. nov. The ultrasturcture of the host cell is typical of the dinoflagellates; however, the organism has 1) an unusual cytoplasmic projection that may be a homologue of the peduncle, 2) a single membrane‐bounded body containing membranous sheets, closely situated next to the endosymbiont, and 3) an electron opaque network‐forming appendage surrounding the transverse flagellum. Name of these features have been found in other dinoflagellates.
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