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A1. Nonmotile algae without chloroplasts: Cyanobacteriophyta
A2. Nonmotile algae with chloroplasts
A3. Motile algae with chloroplasts and flagella
A4. Cells divided into paired semi-cells that are approximate mirror images of each other:
Desmids
B1. Cells mostly solitary unless dividing
B2. Cells linked end-to-end to form filaments
A5. Cells enclosed in glassy, ornamental frustules; many species exhibit gliding movement:
Diatoms
