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kamrunsreno
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General Characteristics of Protists
- Eukaryotic organisms (Domain Eukarya)
- –Nucleus, membrane bounded organelles
- • Most single-celled
- –Some colonial and multicellular
- • Diverse nutritionally
- –Autotrophs, heterotrophs, mixotrophs
- • Reproduction highly varied
- –Asexual & all 3* sexual life histories found
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Excavata--Euglenozoans
- Have spiral or crystalline rod inside flagella
- –Kinetoplastids
- • Ex. Trypanosoma Sleeping sickness (Tsetse fly)
- –Euglenids*
- • Many are mixotrophs (ex. Euglena with chloroplasts)
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Dinoflagellates
Chromalveolates
- Cellulose armor plates
- 2 flagella in plate grooves
- causes red tides (molluscs can become toxic)
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Ciliates
- Chromalveolates
- Cilia to move and feed (ex paramecium)
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Diatoms
- Chromalveolates
- Unicellular photosyntheitc algae with SiO2 cell wall
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brown algae
- Chromalveolates
- Defined by their respective carotenoid pigments
- Many large seaweeds are brown algae (ex kelps)
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Forams
- Rhizarians
- Porous tests (shells) hardened with CaCO3
- -Pseudopodia extend through pores
- Often contain symbiotic algae
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Chlorophytes (green algae)
- Archaeplastida
- Chloroplast structure much like land plants
- same types of chlorophylls as well
- immediate ancestors to land plants
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Plasmodial slime molds
- Unikonts
- Form a plasmodium mass
- --one large supercell, multinucleate
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Cellular slime molds
- Unikonts
- Collection of solitary cells
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Gymnaoebas
- Unikonts
- Consume bacteria and other protists
- Mostly free-living
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