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A1. NONMOTILE ALGAE WITHOUT CHLOROPLASTS:
CYANOBACTERIA
A2. NONMOTILE ALGAE WITH CHLOROPLASTS
A3. MOTILE ALGAE WITH CHLOROPLASTS AND FLAGELLA
B1. MOTILE COLONIES WITH TWO OR MORE CELLS
B2. MOTILE SINGLE-CELL ALGAE
C1. CELLS WITH ONE VISIBLE FLAGELLUM
C2. CELLS WITH TWO EQUAL LENGTH FLAGELLA
C3. CELLS WITH TWO DISSIMILAR FLAGELLA
D1. CELLS WITH ONE FORWARD AND ONE TRAILING FLAGELLUM
D2. CELLS WITH ONE TRANSVERSE AND ONE TRAILING FLAGELLUM (Dinoflagellates)
D3. CELLS WITH TWO FORWARD-DIRECTED APICAL OR SUBAPICAL FLAGELLA
E1. CELLS TINY; LORICA BOWL-SHAPED, TRANSPARENT, WITH SPIRALLING RIDGES:
Kephyrion
and
Pseudokephyrion
E2. CELLS SMOOTH (NOT SPINY); SOLITARY OR IN COLONIES OF OVAL OR TEARDROP-SHAPED CELLS JOINED BY LONG, FRAGILE MUCILAGE THREADS:
Uroglena
and
Uroglenopsis
E3. CELLS TEARDROP-SHAPED OR SPHERICAL; MAY HAVE WARTY SURFACE:
Ochromonas
E4. CELLS SLIPPER-SHAPED, OVAL, TEARDROP-SHAPED; ASYMMETRIC; TWO NEARLY EQUAL FLAGELLA INSERTED BELOW APEX (SUBAPICAL):
Cryptomonads
E5. CELLS OVAL OR SPHERICAL; CELL WALL CONTAINS KNOBBY MUCILAGE GRANULES (NO TRICHOCYSTS):
Vacuolaria
C4. CELLS WITH MORE THAN TWO FLAGELLA
A4. CELLS DIVIDED INTO MIRROR-IMAGE SEMI-CELLS:
Desmids
(see key at
cedar.wwu.edu/cedarbooks/14/
)
A5. CELLS ENCLOSED IN GLASSY, ORNAMENTAL FRUSTULES:
Diatoms
(see key at
diatoms.org)
