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What are Protozoa? - PowerPoint PPT Presentation
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What are Protozoa?. proto = first zoa = animals. single-celled eukaryotic organisms. Combined Protein Consensus Tree. From S.L. Baldauf (1999) Am. Nat. 154:S178. What are Protozoa?. proto = first zoa = plant/animal?. Unicellular eukaryotes protozoa algae yeast/fungi slime molds.
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Combined Protein Consensus Tree
From S.L. Baldauf (1999) Am. Nat. 154:S178
proto = first
zoa = plant/animal?
- Unicellular eukaryotes
- protozoa
- algae
- yeast/fungi
- slime molds
Protozoan Life Styles
- absorb solutes (osmotrophy)
- ingest particulates (phagotrophy)
- predation on bacteria or other protozoa
- pinocytosis (fluid uptake)
- photosynthetic (autotrophy)
- combinations (heterotrophy)
free-living vs. symbiosis
- confused, controversial and constantly changing
- originally based on motility (light microscope)
- ultrastructural (electron microscope) criteria used since 1960’s
- molecular data can help with evolutionary relationships
- monophyletic groups
- descended from common ancestor
- kinetoplastids, apicomplexa, ciliates
- polyphyletic groups
- multiple ancestors
- amebas and flagellates
Genus + species
