Protists
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Protists. Protist Characteristics. An extremely diverse group Eukaryotes Mostly unicellular some colonial some multicellular Some heterotrophic, some autotrophic, some both Some have cell walls. 3 Major Types. Animal-like protozoa Fungus-like Plant- like algae.

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Protists

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Protists

Protists


Protist characteristics

Protist Characteristics

  • An extremely diverse group

  • Eukaryotes

  • Mostly unicellular

    • some colonial

    • some multicellular

  • Some heterotrophic, some autotrophic, some both

  • Some have cell walls


3 major types

3 Major Types

  • Animal-like

    • protozoa

  • Fungus-like

  • Plant- like

    • algae


Animal like protists

“Animal-Like” Protists

Protozoans

Are heterotrophs (some are parasites!)

Types of protozoans:

1. sarcodines

2. ciliaphore

3. flagellates

4. sporozoans


Protist phyla

Protist Phyla

1. Sarcodines– use pseudopodia (“false feet”) to move and get food

EX: Amoebas, foraminifera. radiolarians


Protists

  • http://www.funsci.com/fun3_en/protists/exhibition.htm

  • Amoeba change forms continuously


Protists

2. Ciliophores – use cillia to move

EX: paramecium


Protists

  • http://www.funsci.com/fun3_en/protists/exhibition.htm

  • Paramecia

  • http://ebiomedia.com/gall/ciliates/index.html - more ciliates


Protists

3. Flagellates-have whip-like flagella


Protists

This one is a pathogen – causes diarrhea

EX: Giardia


Dinoflagellates have 2 flagella

Dinoflagellates have 2 flagella


Protists

A related protist, Leishmania, causes the disease leishmaniasis.

These protists are transmitted by biting flies, and are a serious public health problem in much of the world.


Leishamanasis

Leishamanasis


Protists

4. Sporozoans – no method of movement

form spores, many are parasites

EX:

- Toxoplasma- carried by rodents, birds, and domestic cats (can be harmful to unborn babies if mom changes the kitty litter box)

- Plasmodium- causes Malaria (carried by mosquitoes)


Life cycle of malaria

Life Cycle of Malaria


Plant like protists

“Plant-like” protists

Are autotrophs

Mostly algae

Are classified by their pigments (their color) – red, green or brown

Many are multicelled

Do not have stems, leaves and roots like plants

Make up phytoplankton (bottom of ocean food chain)


Plant like protists1

Plant like protists


1 green algae

1. Green Algae

  • Are green in color

  • Ex –

    Spirogyra


Spirogyra

Spirogyra

  • http://www.funsci.com/fun3_en/protists/exhibition.htm


Desmid unicellular green algae

Desmid- unicellular green algae


Green algae volvox

Green algae - Volvox


Green algae haematococcus turns birdbath red

Green algae - HaematococcusTurns birdbath red


2 red algae

2. Red Algae

  • Multicellular

  • Commonly called sea weed

  • Live in deep salt water

  • Are used by humans to help make ice cream and hair conditioner

  • Are eaten in some Asian cultures


3 brown algae

3. Brown Algae

  • Multicellular

  • Commonly called sea weed

  • Thallus- plant-like seaweed body

    • Holdfast- root-like; anchors to surface

    • Stipe- stem-like

    • Blades- leaf-like

  • Have air-filled sacs called air bladders

  • Used in many foods and beauty products


Diatoms

Diatoms

  • Photosynthetic protists

  • Mostly marine

  • Have silica (glass-like) shell

  • Used to make reflective paint, toothpaste, and abrasives


Fungus like protists

“Fungus-Like” Protists

Slime & water molds

Some of these can move

Many are decomposers or parasites


Slime molds

Slime molds


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