1. Plant-like Protists
Unicellular Algae

2. Characteristics
 Photosynthetic
 Mostly unicellular
 Single-celled (euglenoids, dinoflagellated,
diatoms)
 Multicellular algae (red and brown) under Plantae
 Both uni and multicellular- green algae

3. Characteristics
 Mostly motile (phytoflagellates)
 Classification based on their pigments and
internal chemistry; structure
 Thrive in water and damp places
 Sometimes classified as plants

4. Taxonomy
 Phylum Euglenophyta
 Phylum Pyrrophyta
 Phylum Bacillariophyta

5. Phylum Euglenophyta

6. Phylum Euglenophyta
 Euglenophytes/euglenoids
 Closely resemble
zooflagellates (but have
chloroplasts)
 autotrophic
 Animal-like movement- no
cell wall
 Pellicle- maintains cell
shape, aids in movement

7. Euglena
 A long cell with a pouch that contains two
flagella at its interior end for swimming can
rapidly change shape and crawl along a
surface
 Red eyespot (photosensitive)
 10-20 chloroplasts
 Autotrophic but also heterotrophic (saprobic)
 Reproduces asexually through binary fission

8. Phylum Pyrrophyta

9. Phylum Pyrrophyta
 Dinoflagellates
 Mostly photosynthetic
 Possess 2 flagella (one is like a belt, other like
a tail)
 Many are surrounded by thick plates
 Many are luminescent – fire plants
 Reproduce asexually by binary fission
 DNA w/o histones (only eukaryote)

10. Pyrodinium bahanse var. compresa

11. Phylum Bacillariophyta

12. Phylum Bacillariophyta
 Diatoms
 Yellow or brown in color
 Cell wall enriched w/ silica (SiO3)- shaped
like two sides of a petri dish
 Many are capable of gliding motion
 Food reserves in the form of oil
 Reproduce asexually, can form cysts
(resistant stage); sexual reproduction is
uncommone

13.  Freshwater and marine (phytoplankton)
 Diatomaceous earth (soil made of diatoms)

15. Phylum Chrysophyta

16. Phylum Chrysophyta
 Golden algae (yellow green, golden-brown)
 Possess gold-green chloroplasts (xanthophyll)
 Extemely diverse
 Mostly solitary, some can form thread-like
colonies
 Cell wall made of pectin
 Store food in the form of oil
 Reproduce both sexually and asexually

17. Multicellular Algae
Chlorophyta
Phaeophyta
Rhodophyta

18. Phylum Chlorophyta
Unicellular Green Algae

19. Colonial Green Algae

20. Filamentous Green Algae

21. Multicellular Green Algae

22. Phylum Phaeophyta

25. Phylum RhodophytaPhylum Rhodophyta