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A1. Nonmotile algae without chloroplasts:
Cyanobacteriophyta
A2. Motile algae with chloroplasts and flagella
B1. Motile single-cell algae
B2. Motile colonies with 4 or more cells
C1. Cells with two equal flagella in colonies with 4 or more cells
D1. Flat colonies with 4-16 spherical or oval cells:
Gonium
and
Tetrabaena
D2. Spherical, oval, or elliptical colonies (not flat)
C2. Cells with two dissimilar flagella
A3. Nonmotile algae with chloroplasts but without flagella
A4. Cells with paired, symmetric semi-cells:
Desmids
A5. Cells enclosed in glassy, ornamental frustules:
Diatoms
