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PROTISTS . Most diverse; 200,000 + species; wide variety of shapes, sizes, & colors; Unicellular (amoeba) & Multicellular (seaweed); All Eukaryotic; can be jellylike, rigid, or colonial; 3 groups: Protozoans Algae Fungus-Like. Protozoans.

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Most diverse; 200,000 + species; wide variety of shapes, sizes, & colors; Unicellular (amoeba) & Multicellular (seaweed); All Eukaryotic; can be jellylike, rigid, or colonial; 3 groups:

  • Protozoans
  • Algae
  • Fungus-Like
protozoans
Protozoans

Animal-like protists –unicellular heterotrophs that feed on other organisms or dead organic matter; Grouped based on movement; 4 types

sporozoans
Sporozoans
  • Parasitic (nonmotile)
  • Produce spores
  • ExamplePlasmodium falciparum

(causes Malaria)

amoebas
Amoebas
  • Pseudopodia for movement
  • Blob-like
  • Most marine (few freshwater—oozes, wet moss, & moist soil)
  • Asexual Reproduction
  • 2 types:
    • Foraminiferans – calcium carbonate shells
    • Radiolarians – silica shells
flagellates
Flagellates
  • Move by whipping flagella from side

to side

  • Parasitic
  • Examples
    • In termite intestines
    • Giardia lamblia(causes giardiasis = water-borne diarrhea)
ciliates
Ciliates
  • Move by beating cilia
  • Most complex Protozoans
  • Example
    • Paramecia
algae
Algae
  • Plant-like Protists
  • Photosynthetic
  • Unicellular & multicellular species
  • Produce more than ½ the Earth’s oxygen
  • 6 Phyla
euglenoids
Euglenoids
  • Unicellular; Aquatic w/traits of plants & animals
  • Most have chlorophyll (photosynthesis)
  • Move by using 1 or 2 flagella
  • Autotrophic or heterotrophic
  • Euglena sp.

Phacusacuminatus

diatoms
Diatoms
  • Golden Algae; Unicellular w/ Silica shells
  • Shaped like a pillbox
  • Photosynthetic Autotrophs
  • Marine & some freshwater
  • Asexual & sexual reproduction
  • Contain chlorophyll & carotenoids
diatom reproduction
Diatom Reproduction
  • Asexual – box splits & each half make new half
  • Sexual -- gametes
dinoflagellate
Dinoflagellate
  • Spinning Algae
  • Unicellular; thick cellulose plates in cell walls
  • 2 flagella (causes spinning)
  • Most marine; some bioluminescent
  • Contain chlorophyll, carotenoids, red pigments
  • Toxins – red tides – can be lethal– harvesting of shellfish banned
red algae
Red Algae
  • Red Seaweed
  • Multicellular; chlorophyll & phycobilins (red & blue pigments)
  • Marine Tropical or Cool Rocky Coasts
brown algae
Brown Algae
  • Kelp; many w/air bladders to keep afloat near surface
  • Multicellular
  • Contain chlorophyll, yellowish-brown carotenoid (fucoxanthin)
green algae
Green Algae
  • Unicellular & Multicellular & Colonial (seaweed Volvox colony hollow ball made of 100’s of flagellated cells in single layer)
  • Chlorophyll & some have yellow pigments
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Mostly freshwater; others in oceans, moist soil, tree trunks, snow, & in fur of sloths

  • Sexual & asexual reproduction (fragmentation)
fungus like protists
Fungus-like Protists
  • Multicellular
  • Form delicate, net-like structures on surfaces of food supplies
  • 3 Phyla
slime molds
Slime Molds
  • Colorful (yellow/orange to blue, violet, jet black
  • Animal-like = engulf food like amoebas
  • Reproduce by spores
  • 2 main types: Plasmodial & Cellular
plasmodial slime molds
Plasmodial Slime Molds
  • Form plasmodium for movement & for reproduction
  • Moves by amoeboid action (creeps along)
  • Forming netlike structure on surfaces of decaying logs/leaves
  • Multiple nuclei
  • Spore reproduction in dry

conditions

cellular slime molds
Cellular Slime Molds
  • Food plentiful – individual haploid, amoeboid
  • Food scarce – form multicellular mass w/distinct cell membranes
  • Divide by regular cellular division
  • Tend to be microscopic
water molds downy mildews
Water Molds & Downy Mildews
  • Live in water or moist places
  • Decomposers & parasites
water molds
Water Molds
  • Look like fuzzy, white growths on decaying matter
  • Grow as mass of threads
  • Produce flagellated reproductive cells
downy mildews
Downy Mildews
  • Parasitize plants
  • Some cause plant diseases
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