Download Protists PPT

What is a Protist?
Includes more than 200,000 species
 Protists are more defined by what they
are not:

 They aren’t plants, animals, fungi, or
prokaryotes
Unicellular eukaryotes
 3 groups: Animal-like, Plant-like, and
Fungus-like

Animal-like Protists - Protozoans
Heterotrophic
 4 phyla are separated by movement
 Phylum Zoomastigina (Zooflagellates) –

 Have either one or two flagella
 All reproduce asexually by mitosis
 Some can also reproduce sexually – meiosis

Phylum Sarcodina (Sarcodines) –
 Have pseudopods (“false foot”) for feeding
and movement
Sarcodine
Zooflagellate
Animal-like Protists - Protozoans

Phylum Ciliophora (Ciliates) –
 Have cilia which are short hair-like
projections used for feeding and movement

Phylum Sporozoa (Sporozoans) –
 Do not move on their own
 Parasitic

Many protozoans can cause serious
diseases, including malaria and African
Sleeping Sickness.
Sporozoan
Ciliate
Plant-like Protists – Algae
Autotrophic protists – photosynthesis
 All contain chlorophyll and accessory
pigments allow algae to harvest and use
the energy from sunlight.
 7 phyla of plant-like protists
 Phylum Euglenophyta (Euglenophytes) –

 Have two flagella but no cell wall
 In absence of sunlight, they have the ability to
be heterotrophic
Euglena
Plant-like Protists – Algae

Phylum Chrysophyta (Chrysophytes) –
 Have golden chloroplasts
 Can form threadlike colonies

Phylum Bacillariophyta (Diatoms) –
 Produce thin, delicate cell walls rich in silicon
which is the main component of glass
 Shape is similar to a petri dish

Phylum Pyrrophyta (Dinoflagellates) –
 Half are autotrophic, half are heterotrophic
 Have 2 flagella
 Many are bioluminescent
Chrysophytes
Diatoms
Some dinoflagellates can
cause red tides!
Dinoflagellates
Plant-like Protists – Algae

Phylum Rhodophyta (Red Algae) –
 Contain chlorophyll a and red accessory
pigments called phycobilins

Phylum Phaeophyta (Brown Algae) –
 Contain chlorophyll a and c, and a brown
accessory pigment called fucoxanthin
 Kelp

Phylum Chlorophyta (Green Algae) –
 Contain chlorophyll a and b
 Share many similar characteristics to land plants
Red Algae
Brown Algae
Green Algae
Fungus-like Protists
Heterotrophs that absorb nutrients from
dead or decaying organic matter
 Lack a cell wall
 3 groups

 Phylum Acrasiomycota – Cellular slime
molds
 Phylum Myxomycota – Acellular slime molds
 Phylum Oomycota – Water molds
Fungus-like Protists
Myxomycota
Oomycota
Acrasiomycota