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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
C4. Cells with more than two flagella
D1. Cells spherical or oval with what appears to be three flagella (two flagella and a haptonema):
Chrysochromulina/Prymnesium
D2. Cells spherical, oval, or elliptical, with four equal flagella:
Carteria
D3. Cells heart-shaped and flattened, with four equal flagella:
Tetraselmis
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
