Similar genera

Carteria (four flagella); Chlorogonium (elongated cells, often pointed at one end); Dunaliella (no cell wall); Dysmorphococcus (spherical lorica without sutures); Haematococcus (wall separate from chloroplast-bearing cytoplasm, connected to cytoplasm by thin strands); Phacotus (lorica with longitudinal sutures); Polytoma (colorless with leucoplast); Polytomella (no cell wall, four flagella, colorless with leucoplast); Tetraselmis (four flagella, flagella arise from a pit); Tetraspora (gelatinous colony in water bodies with nonrandomarrangement of cells, cells with nonmotile pseudocilia).

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