Playfair, 1921
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Cells flattened, curved, strongly elongated. Anterior end is slightly tapered into narrow neck, often with 1–2 teeth, posterior end bluntly rounded. The pellicle is gently striated length-wise, the striae occurring in the form of tiny papillae. The nucleus is slightly shifted to the posterior end of the cell or, rarely occurs in its center. Cells 50.0–78.5 µm long, 6.5–9.0 µm wide. (по: Cabała, 2003)