The taxonomic hierarchy and kingdoms

The taxonomic hierarchy

• Inside the Eukarya, organisms are sorted into smaller and smaller groups.
• This is the taxonomic hierarchy.
• The Eukarya split into four kingdoms.

Kingdom to species

• The levels: Kingdom → Phylum → Class → Order → Family → Genus → Species.
• Each level is a smaller, more closely related group, ending at a single species.

The four eukaryote kingdoms

• Protoctista — mostly single-celled (e.g. Amoeba).
• Fungi — feed by absorbing food; cell walls of chitin.
• Plantae — make their own food by photosynthesis.
• Animalia — feed on other organisms.

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