Lecture Outlines by Gregory Ahearn, University of North Florida Copyright © 2011 Pearson Education Inc. Chapter 18 Systematics: Seeking Order Amidst Diversity.

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Lecture Outlines by Gregory Ahearn, University of North Florida Copyright © 2011 Pearson Education Inc. Chapter 18 Systematics: Seeking Order Amidst Diversity Adapted from:

Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How Are Organisms Named and Classified?  Taxonomy – names and classifies organisms –Modern taxonomy established by Carolus Linnaeus (1707–1778) –Introduced two-part scientific names –Genus - a group that includes very closely related species –Species – what is it?

Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Three Species of Bluebird  The genus Sialia (bluebirds) includes three species –Sialia sialis (the eastern bluebird) –Sialia mexicana (the western bluebird) –Sialia currucoides (the mountain bluebird) Fig. 18-1

Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How Are Organisms Named and Classified?  Scientific names are unique and recognized worldwide –Bombus pennsylvanicus

Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How Are Organisms Named and Classified?  The Linnaean classification system came to include eight major categories or taxonomic ranks Domain  Kingdom  Phylum  Class  Order  Family  Genus  Species PLAY Author Animation: Taxonomic Classification

Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How Are Organisms Named and Classified?  Modern classification emphasizes patterns of evolutionary descent –The more categories two organisms share, the closer their evolutionary relationship

Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How Are Organisms Named and Classified?  Anatomy plays a key role in systematics

Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e 1 How Are Organisms Named and Classified?  Molecular similarities are also useful –Ex. Human vs. chimpanzee chromosomes

Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e What Are the Domains of Life?  Before 1970, systematists divided all species into two groups –Animalia –Plantae (including plants, bacteria, fungi, and photosynthetic eukaryotes) –A three-domain system more accurately reflects life’s history –Bacteria (prokaryotic) –Archaea (prokaryotic) –Eukarya (eukaryotic)

Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e The Tree of Life Fig BACTERIAARCHAEAEUKARYA fungi plants animals protists

Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e What Are the Domains of Life?  Within the domain Eukarya, there are four different groups of organisms: –Animalia (animals) –Plantae (plants) –Fungi (fungi) –Protists (eukaryotic organisms that are not animals, plants or fungi)

Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e PLANTAE“PROTISTS”ANIMALIAFUNGI Apicomplexans Ciliates KinetoplastidsEuglenidsDiplomonads Phaeophyta (brown algae) Oomycota (water molds) Rhodophyta (red algae) Chlorophyta (green algae) Bryophyta (liverworts, mosses) Pteridophyta (ferns) Zygomycota Amoebozoans Ascomycota Basidiomycota Porifera (sponges) Cnidaria (anemones, jellyfish) Protostomes (worms, arthropods, mollusks) Deuterostomes (sea urchins, sea stars, vertebrates) Diatoms Dinoflagellates Angiosperms (flowering plants) Gymnosperms A Closer Look at the Eukaryotic Tree of Life Fig. 18-7

Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Why Do Classifications Change?  Species designations change when new information is discovered  The biological species definition can be difficult or impossible to apply –Ex. Most bacteria, archaea, and protists reproduce asexually

Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How Many Species Exist?  The number of named species is currently about 1.5 million (biased toward large organisms in temperate regions) –5% are prokaryotes and protists –22% are plants and fungi –73% are animals

Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How Many Species Exist?  It is estimated that 7 million to 10 million species may exist  Between 7,000 and 10,000 new species are identified annually, mostly in the Tropics  Tropical rainforests are believed to be home to two-thirds of the world’s existing species, most of which have yet to be named

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