1. Early Classification Aristotle was a greek scholar
Observed behavior, appearance and movement.
Three groups.
Fly
Swim
Walk/crawl run.

2. Problems with ARISTOTLE
Not Specific Enough.
Similar organisms in different groups.
Different organisms in similar groups.

3. Two Kingdom System (Proposed by Aristotle)
Plantae
Bacteria
Fungi
Algae
Plants

4. Two Kingdom System
Animalia
Animals
Protozoa

5. Problem with Aristotle’s Classification System:
If it was green, it was a plant regardless of other features.

6. Five Kingdom System Animalia Plantae Fungi Protista Procaryote/Monera
KEY FACT; As more organisms and characteristics are discovered. More kingdoms, domains etc are created.

7. Carolus Linnaeus 1753 Kingdom Through Species Binomial Nomenclature
Mycobacterium tuberculosis
Grouped by shared body structures
• Groups called taxa (singular: taxon)
• Science of naming groups is called taxonomy

8. Taxonomic Hierarchy Domain Kingdom Phylum/Division Class Order Family
(Carl Woese 1978)
Kingdom
Phylum/Division
Class
Order
Family
Genus
Species

9. Three Domain System (Difference in rRNA and Cell Wall in Prokaryotic Organisms)
Domain Eukaryae
All Eukaryotic Organisms
Domain Eubacteria
True Bacteria and Cyanobacteria
Domain Archaea
Ancient “Extreme” Bacteria

10. Taxonomy
The science of biological classification, by grouping organisms with similar characteristics.

11. Three Interrelated Parts of Taxonomy
Classification
Arrangement into groups
Nomenclature
Assignment of Names
Identification
Determining Identity