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A1. Nonmotile algae without chloroplasts:
Cyanobacteriophyta
A2. Motile algae with chloroplasts and flagella
A3. Nonmotile algae with chloroplasts but without flagella
B1. Cells usually epiphytic, epizoic, or endozoic
C1. Cells, colonies, filaments or pseudofilaments attached to aquatic plants (epiphytic)
C2. Cells, colonies, filaments or pseudofilaments attached or associated with or attached to aquatic animals (epizoic)
C3. Chlorella-like cells living inside zooplankton and other aquatic animals (endozoic):
Zoochlorella group
B2. Nonmotile solitary and colonial algae; cells not (or usually not) epiphytic, epizoic, or endozoic
B3. Nonmotile algae that form filaments or pseudofilaments
A4. Cells with paired, symmetric semi-cells:
Desmids
A5. Cells enclosed in glassy, ornamental frustules:
Diatoms
