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Living organisms are classified into 3 Domains. 1. Bacteria 2. Archaea 3. Eukarya. 4 Kingdoms in this Domain. Domain Eukarya has 4 Kingdoms. 1. Kingdom Protista 2. Kingdom Fungi 3. Kingdom Plantae 4. Kingdom Animalia. Kingdom Protista.

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living organisms are classified into 3 domains
Living organisms are classified into 3 Domains

1. Bacteria

2. Archaea

3. Eukarya

4 Kingdoms in this Domain

domain eukarya has 4 kingdoms
Domain Eukarya has 4 Kingdoms

1. Kingdom Protista

2. Kingdom Fungi

3. Kingdom Plantae

4. Kingdom Animalia

kingdom protista
Kingdom Protista
  • Believed to have evolved as the first eukaryotes.
  • Organisms in this group just don’t fit perfectly into any other Kingdom in the Domain Eukarya.
Most protists are unicellular, but some multicellular
  • Asexual reproduction is common, but sexual reproduction also occurs.
  • Most diverse group of organisms of any kingdom.
3 divisions of protist
3 Divisions of Protist
  • Plant-like protist
  • Animal-like protist
  • Fungus-like protist
diversity of protista 3 major divisions
Diversity of Protista3 Major Divisions

1st Plant-like Protist

Phytoplankton Algae (Sea Weed)

Euglenoids Red Algae

Diatoms Brown Algae

Dinoflagellates Green Algae

Unicellular Multicellular

2nd division of protista
2nd Division of Protista
  • Animal Like Protist or Protozoa
    • Amoebas
    • Flagellates
    • Ciliates
    • Sporozoans
3 rd division of protista
3rd Division of Protista
  • Fungus-Like Protist
    • Slime Molds
    • Water Molds
    • Downy Mildews
plant like protist it is thought that these evolve into plants with specialized cells and tissues
PLANT-LIKE PROTISTIt is thought that theseEvolve into Plants with specialized cells and tissues
phylum chlorophyta green algae
Phylum Chlorophyta Green Algae

Spirogyra is a filamentous green algae. They form end-to-end chains of cells. Often found on the surfaces of ponds.

Conjugation 

(similar to bacterial conjugation)

phylum chlorophyta green algae13
Phylum Chlorophyta: Green Algae

Multicellular green algae

Chara is a stonewort, the type of green algae believed to be most closely related to plants.

phylum chlorophyta green algae14
Phylum ChlorophytaGreen Algae

Volvox is a colonial green alga which has many individuals living together

green algae
Green Algae
  • Pediastrum, a flat colony of green algae
phylum rhodophyta red algae
Phylum RhodophytaRed Algae

Commercial importance of red algae:

Agar—laboratory use, gelatin used in Petri dishes

Carrageen—thickening agent in commercial products


phylum phaeophyta brown algae
Phylum Phaeophyta Brown Algae

Underwater forests—habitats

Kelp—food, habitats for aquatic organisms

Pectin—used to make gelatin

phylum bacilariophyta diatoms or golden algae
Phylum Bacilariophyta:Diatoms or Golden Algae

Silica—the shells of these organisms are used to make glass, concrete,

Diatomaceous earth -dead diatoms settle to seafloor, collected and used in abrasives


abundant food source for marine organisms

phylum dinoflagellata spinning algae 2 flagella for movement
Phylum Dinoflagellata: Spinning Algae-2 flagella for movement

Some are bio-luminescent

Some Symbiotic

Some Parasitic

Red tide—population explosion of certain types of dinoflagellates. Kills large amounts of fish. Depletes water of oxygen and releases toxins into the water.

red tide dinoflagellates
Red Tide-Dinoflagellates

The toxins produces by the Red Tide can make humans sick. Harvesting shellfish is banned during this time.

phylum euglenophyta
Phylum Euglenophyta


This phylum is a typical example of the difficulties in categorizing protists:

1/3 have chloroplasts, the other 2/3 do not.

No sexual reproduction. Longitudinal fission.

Propels the body through water.

ANIMAL-LIKE PROTISTIt is thought that these evolve into of Animals with multicellularity and specialized cells and tissue
phylum zoomastigina move by flagella
Phylum Zoomastigina: Move by Flagella

Trypanosoma transmitted by the bite of a tsetse fly, cause African Sleeping Sickness.

Animal-like protists


Trypanosoma are Flagellates which cause African Sleeping Sickness Transmitted to their human hosts by a tsetse fly

Below: Trypanosoma in a sample of human blood X 400.

more flagellates phylum zoomastigina
More Flagellates Phylum Zoomastigina

Animal-like protists

Other flagellates are known to spread sexually by infecting the vagina and urethra of women, and the prostate, seminal vesicles and urethra of men.



Giardia Lamblia

Attaches to intestinal tract and causes diarrhea

Can become infected by drinking contaminated water from stream

phylum rhizopoda amoebas move by pseudopodia
Phylum Rhizopoda-AmoebasMove by Pseudopodia

Phylum Rhizopoda- amoebas, including Entamoeba hystolytica

Phylum Foraminifera- calcium carbonate shell

Phylum Actinopoda-radiolarians


White Cliffs of Dover, Egyptian pyramids


The projections are called pseudopods or “false feet.”

phylum ciliophora or ciliates move by cilia
Phylum Ciliophora or Ciliates Move by Cilia

Very diverse group; very complex single-celled organisms which use cilia for movement.

phylum sporozoa parasite
Phylum Sporozoa-Parasite

Life cycle of Plasmodium vivax,


Causes malaria

Carried by the Anopheles


what are fungus like protists
What are Fungus-Like Protists?
  • Organisms which have some fungus-like features
  • Heterotrophic
  • Decompose organic material
summary of protista kingdom
Summary of Protista Kingdom
  • Most diverse group, autotrophic and heterotrophic
  • Eukaryotes, single celled and multicelled
  • Some move by: flagella, pseudopodia, cillia
  • Some are parasites
  • Reproduction both asexual and sexual
  • Some are harmless, some cause sleeping sickness , malaria and STDs