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A1. Nonmotile algae without chloroplasts: Cyanobacteriophyta
A2. Nonmotile algae with chloroplasts
A3. Motile algae with chloroplasts and flagella
B1. Solitary motile algae
C1. Cells with one visible flagellum
C2. Cells with two equal length flagella
D1. Cells with bright red or partly red chloroplast surrounded by spherical mucilage:
Haematococcus lacustris
D2. Cells slipper-shaped, oval, teardrop-shaped; asymmetric; two nearly equal flagella inserted below apex (subapical):
Cryptomonads
D3. Spherical, oval, or elliptical cells with two equal flagella inserted at the apex (large, difficult group):
Chlamydomonas
and similar
C3. Cells with 2 dissimilar flagella
C4. Cells heart-shaped and flattened, with 4 equal flagella:
Tetraselmis
B2. Motile colonies with two or more cells
A4. Cells divided into paired semi-cells that are approximate mirror images of each other:
Desmids
A5. Cells enclosed in glassy, ornamental frustules; many species exhibit gliding movement:
Diatoms
