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Protists The world of Protists: Animal-like Protists

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Presentation on theme: "Protists The world of Protists: Animal-like Protists"— Presentation transcript:

1 Protists The world of Protists: Animal-like Protists
Plant-like Protists Fungus-like Protists

2 Kingdom Protista Cell Number: Mostly single-celled, some colonial
Cell Type: Eukaryotic (has a nucleus and organelles) Feeding: Hetero or autotrophic Reproduction: Mostly asexual Summary: Single-Celled Eukaryotes

3 Protist Diversity 200,000 species come in different shapes, sizes, and colors All are eukaryotes – have a nucleus and membrane-bound organelles Reproduce sexually or asexually

4 Protozoans Animal-like Protists

5 Protozoans Unicellular – made up of one cell
Heterotrophs – they eat other organisms or dead organic matter Classified by how they move

6 Amoebas Flagellates Ciliates Sporazoans
Phyla of Protozoans Amoebas Flagellates Ciliates Sporazoans

7 Amoebas: the blobs No cell wall
Move using pseudopods – plasma extensions or “fake feet” (draw picture) Engulf bits of food by phagocytosis


9 Flagellates: the motorboats
Use a flagella – a whip like tail to move (draw one) Some cause diseases

10 Trichomonas vaginalis: an STD

11 Ciliates: the hairy ones
Move with cilia – tiny beating hairs (draw one)


13 Sporazoans: the parasite
Non-motile - Do not move Live inside a host One type causes malaria

14 Malaria in red blood cells

15 Algae Plantlike Protists

16 What are Algae? Colonial– made of more than one cell, but can live singularly Photosynthetic – make their own food No roots, stems, or leaves Each has chlorophyll and other photosynthetic pigments

17 Euglenoids Diatoms Dinoflagellates Red, Brown, & Green Algae
Phyla of Algae Euglenoids Diatoms Dinoflagellates Red, Brown, & Green Algae

18 Euglenoids: The Survivors
Aquatic Move around like animals Can ingest food from surroundings when light is not available


20 Diatoms: The Golden Ones
Have shells made of silica (glass) Photosynthetic pigment called carotenoids – give them a golden color


22 Dinoflagellates: The Spinning Ones
Spin around using two flagella Responsible for Red Tides Create toxins that can kill animals and sometimes people




26 Red Algae: The…uh…Red Ones (duh)
Seaweeds marine organisms Have red and blue pigments



29 Brown Algae: The Brown Ones (You think?)
They have air bladders to help them float at the surface – where the light is.


31 Green Algae: Yeah, You Guessed it, The Green Ones
Most live in fresh water Live alone or in groups called colonies Ancestor to land plants


33 Fungus-like Protists

34 Characteristics in Common
All form delicate, netlike structures on the surface of their food source, mold-like Obtain energy by decomposing organic material


36 Phyla of Fungus-like Protists
Plasmodium Slime Molds Cellular Slime Molds Water Molds & Downy Mildews

37 Slime Molds Live in cool moist, shady places where they grow on damp, organic matter

38 Plasmodium Slime Molds
Form plasmodium: a mass of cytoplasm that contains many diploid nuclei but no cell walls or membranes – its feeding stage Creeps by amoeboid movement – 2.5 cm/hour

39 Plasmodium continued…
May reach more than a meter in diameter Form reproductive structures when surroundings dry up Spores are dispersed by the wind and grow into new plasmodium



42 Cellular Slime Molds In feeding mode, they exist as individual amoebic cells When food becomes scarce, they come together with thousands of their own kind to reproduce May look like a plasmodium




46 Water Molds and Downy Mildews
Live in water or moist places Feed on dead organisms or parasitize plants Fuzzy white growths



49 That’s All

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