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A New Heterolobosean Amoeboflagellate, Tetramitus dokdoensis n. sp., Isolated from a Freshwater Pond on Dokdo Island in the East Sea, Korea

The genus Tetramitus is a representative amoeboflagellate group within the Heterolobosea, and currently contains over a dozen species. Here, a new heterolobosean amoeboflagellate was isolated from a freshwater pond on Dokdo Island, Korea. The amoebae have eruptive pseudopodia, no uroidal filament, and a nucleus with a central nucleolus. The length and width of the amoebae are 15.5–28.0 μm and 5.4–12.6 μm, respectively. The flagellates are conical, with 4 flagella of equal length (~10 μm). There is a discrete rostrum in the subapical region of the flagellate form. The cyst has thin endo‐ and ectocyst layers and no cyst pores. The amoeba shows slow movement at 37 °C, but does not move at 42 °C under a light microscope. Phylogenies of the 18S rRNA gene and the ITS1‐5.8S rRNA gene‐ITS2 sequence show that the strain belongs to a subclade of Tetramitus that includes Tetramitus rostratus, Tetramitus waccamawensis and Tetramitus entericus, amongst others. Nonetheless, the strain is distinct from other species in both molecular phylogenetic trees. Thus the strain isolated from the Dokdo Island is proposed as a novel species, Tetramitus dokdoensis n. sp.