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A1. Nonmotile algae without chloroplasts:
Cyanobacteriophyta
A2. Motile algae with chloroplasts and flagella
B1. Motile single-cell algae
C1. Cells with one visible flagellum
C2. Cells with two equal length flagella
C3. Cells with two dissimilar flagella
D1. Cells with one forward and one trailing flagellum
D2. Cells with one transverse and one trailing flagellum (Dinoflagellates)
D3. Cells with two forward-directed or subapical flagella
C4. Cells with more than two flagella
B2. Motile colonies with 4 or more cells
A3. Nonmotile algae with chloroplasts but without flagella
A4. Cells with paired, symmetric semi-cells:
Desmids
A5. Cells enclosed in glassy, ornamental frustules:
Diatoms
