taxonomy n.
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Taxonomy. The science of classifying organisms . Classify To arrange according to similarities or differences. Why classify?. Biologists use classification to organize living things into groups so that the organisms are easier to study. We classify to make our lives easier.

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The science of classifying organisms.


To arrange according to similarities or differences.

why classify
Why classify?

Biologists use classification to organize living things into groups so that the organisms are easier to study.

We classify to make our lives easier.

  • Simple classifications
  • Used common names
  • Plant or animal?
  • If an animal does it have blood?

does it

    • Fly
    • Swim
    • Walk/Crawl

DISCUSSION QUESTION - Using Aristotle's 3-group system (based on movement), name 2 animals that would fit each of the 3 groups.

problems with this system
Problems with this system?

Some animals can walk, swim, and fly

carolus linnaeus 1700s
Carolus Linnaeus 1700s
  • Described organisms with two word names, instead of polynomials
  • Developed binomial nomenclature
  • First word = Genus name (Capitalized)
  • Second word = species name (lowercase)

scientific name

    • Example Canis lupus

Always italicized or underlined

why binomial nomenclature
Why binomial nomenclature?
  • Binomial - 2 name
  • Nomenclature – naming system
  • Much easier than a 10+ word name under old “polynomial system”
  • Same name no matter where you go (Latin)
  • Less confusion
taxonomic hierarchy
Taxonomic Hierarchy
  • Names organisms and their relationships from very broad to very specific
three domains of life
Three Domains of Life

There used to be 2, why do you think there are 3 now?


Domain Archaeabacteria: Life's Extremists...! Archaea are found in the harshest environments on Earth, and are the oldest known organisms on Earth, appearing in the fossil record over 3.6 BILLION years ago (3,600,000,000 years ago!)


Domain Bacteria (or Eubacteria):

is familiar to most people when associated with human or animal disease. However, most bacterial species do not (and cannot) cause disease.

Most species even play beneficial roles for humans by producing antibiotics and food.


Domain Eukarya

A single-celled or multicellular organism whose cells contain a distinct membrane-bound nucleus.

(Organism’s cell has a nucleus.)


Why has taxonomy changed throughout history?

Do you think it will continue to change?

  • We are now filling out our charts
  • Unicellular prokaryotes
  • Autotrophs
  • Cell wall


Eu = true

Have membrane bound nuclei

phylum examples
Phylum examples
  • Chordata Cord Chordates Hollow dorsal nervous chord, notochord, pharyngeal slits, endostyle, post-anal tail about 100,000+ Cnidaria Stinging nettle Coelenterates Nematocysts (stinging cells) about 11,000 Ctenophora Comb bearer Comb jellies Eight "comb rows" of fused cilia about 100 modern species Cycliophora Wheel carrying Symbion Circular mouth surrounded by small cilia
classification of humans
Classification of Humans
  • Kingdom Animalia
  • Phylum Chordata
  • Class Mammalia
  • Order Primates
  • Family Hominidae
  • Genus Homo
  • Species sapiens
is your table filled out

Is your table filled out?

Don’t lose it!!!