lecture_ch11[1].ppt - Chapter 11: Animal Diversification...

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Chapter 11: Animal DiversificationVisibility in motionLectures by Mark Manteuffel, St. Louis Community College
Learning GoalsDefine an animal and the keydistinctions that divide the species.Discuss evolutionary success.Define and describevertebrates andtheir evolution.Define and describe the terrestrialvertebrates, including amphibians,birds, and mammals.
Learning GoalsDescribe early human lifestyles andhuman evolution.Define and describe theinvertebrates, including echinoderms,arthropods, molluscs, annelids,flatworms, cnidarians, and sponges.Are some animals smarter thanothers?
11.1 What is an animal?
Take-home message 11.1Animals are organisms that sharethree characteristics:
11.2Four keydistinctions divide theanimals.
1) Does the animal havedefined tissues, withspecialized cells?
2) Does the animal developwith radial symmetry orbilateral symmetry?
3) During development, does theanimal’s gut develop fromfront to back or back to front?ProtostomesandDeuterostomes
4) Does growth occur by moltingor by adding continuously tothe skeletal elements?
Take-home message 11.2The animals probably originated froman ancestral protist.Four key distinctions divide theextant animals:1) tissue or not2) radial or bilateral symmetry3) protostome or deuterostomedevelopment4) growth through molting or not
11.3Everything that isnot extinct isevolutionarily successful.
What is “success”evolutionarily?
Take-home message 11.3From an evolutionary perspective,all extant species are successful.However, some groups arerepresented by more species thanothers.Among the 36 animal phyla, 9 phylaaccount for more than 96 percent ofall described animal species.
11.4All vertebrates aremembers of the phylumChordata.
Fourdistinctfeatures ofchordates
The NotochordA rod of tissue extending from the headto the tailStiffens the body when muscles contractduring locomotionIn advanced chordatespresent only in early embryosreplaced by the vertebral column (backbone)

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Term
Spring
Professor
Mr.Wallace
Tags
Evolution, Lecture, bio, take home message, Chpt 11

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