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Classification copyright cmassengale.

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1 Classification copyright cmassengale

2 There are 13 billion known species of organisms
This is only 5% of all organisms that ever lived!!!!! New organisms are still being found and identified copyright cmassengale

3 What is Classification?
Classification is the arrangement of organisms into orderly groups based on their similarities Classification is also known as taxonomy Taxonomists are scientists that identify & name organisms copyright cmassengale

4 Benefits of Classifying
Accurately & uniformly names organisms Prevents misnomers such as starfish & jellyfish that aren't really fish Uses same language (Latin or some Greek) for all names Sea”horse”?? copyright cmassengale

5 Confusion in Using Different Languages for Names
copyright cmassengale

6 Early Taxonomists 2000 years ago, Aristotle was the first taxonomist
Aristotle divided organisms into plants & animals He subdivided them by their habitat ---land, sea, or air dwellers copyright cmassengale

7 Carolus Linnaeus 1707 – 1778 18th century taxonomist
Classified organisms by their structure Developed naming system still used today copyright cmassengale

8 Carolus Linnaeus Called the “Father of Taxonomy”
Developed the modern system of naming known as binomial nomenclature Two-word name (Genus & species) copyright cmassengale

9 Standardized Naming Binomial nomenclature used Genus species
Latin or Greek Italicized in print Capitalize genus, but NOT species Underline when writing Turdus migratorius copyright cmassengale American Robin

10 Binomial Nomenclature
copyright cmassengale Which TWO are more closely related?

11 Classification Groups
Taxon ( taxa-plural) is a category into which related organisms are placed There is a hierarchy of groups (taxa) from broadest to most specific Domain, Kingdom, Phylum, Class, Order, Family, Genus, species copyright cmassengale

12 Hierarchy-Taxonomic Groups
Domain Kingdom Phylum (Division – used for plants) Class Order Family Genus Species BROADEST TAXON Genus and species are the two names used to identify specific organisms in the binomial system of classification. Division is used for plants. Most Specific copyright cmassengale

13 Dumb King Phillip Came Over For Gooseberry Soup! copyright cmassengale

14 copyright cmassengale

15 Domains Broadest, most inclusive taxon Three domains
Archaea and Bacteria are unicellular prokaryotes (no nucleus or membrane-bound organelles) Eukarya are more complex and have a nucleus and membrane-bound organelles copyright cmassengale

16 ARCHAEA Kingdom - ARCHAEBACTERIA Probably the 1st cells to evolve
Live in HARSH environments Found in: Sewage Treatment Plants (Methanogens) Thermal or Volcanic Vents (Thermophiles) Hot Springs or Geysers that are acid Very salty water (Dead Sea; Great Salt Lake) - Halophiles copyright cmassengale

17 ARCHAEAN copyright cmassengale

18 BACTERIA Kingdom - EUBACTERIA Some may cause DISEASE
Found in ALL HABITATS except harsh ones Important decomposers for environment Commercially important in making cottage cheese, yogurt, buttermilk, etc. copyright cmassengale

19 Live in the intestines of animals
copyright cmassengale

20 Domain Eukarya is Divided into Kingdoms
Protista (protozoans, algae…) Fungi (mushrooms, yeasts …) Plantae (multicellular plants) Animalia (multicellular animals) copyright cmassengale

21 Protista Most are unicellular Some are multicellular
Some are autotrophic, while others are heterotrophic Aquatic copyright cmassengale

22 Fungi Multicellular, except yeast
Absorptive heterotrophs (digest food outside their body & then absorb it) Cell walls made of chitin copyright cmassengale

23 Plantae Multicellular Autotrophic
Absorb sunlight to make glucose – Photosynthesis Cell walls made of cellulose Growth, with increases in size and number of cells, is part of development. Development involves many stages from conception until death. copyright cmassengale

24 Animalia Multicellular
Ingestive heterotrophs (consume food & digest it inside their bodies) Feed on plants or animals copyright cmassengale

25 copyright cmassengale

26 Taxons Most genera contain a number of similar species
The genus Homo is an exception (only contains modern humans) Classification is based on evolutionary relationships copyright cmassengale

27 copyright cmassengale

28 Cladogram Diagram showing how organisms are related based on shared, derived characteristics such as feathers, hair, or scales copyright cmassengale

29 Primate Cladogram copyright cmassengale

30 Dichotomous Keying Used to identify organisms
Characteristics given in pairs Read both characteristics and either go to another set of characteristics OR identify the organism copyright cmassengale

31 Example of Dichotomous Key
1a Tentacles present – Go to 2 1b Tentacles absent – Go to 3 2a Eight Tentacles – Octopus 2b More than 8 tentacles – 3 3a Tentacles hang down – go to 4 3b Tentacles upright–Sea Anemone 4a Balloon-shaped body–Jellyfish 4b Body NOT balloon-shaped - 5 copyright cmassengale

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