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19OriginAnimalsSpr11Post

19OriginAnimalsSpr11Post - (E pluribus unum)2 Eukaryote...

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(E pluribus unum) 2 The Origin of Animals Eukaryote Diversity ! You are here Goals of the next three lectures ! 1) “_______ the Tree” of animal evolution ! Origins, evolution of major features/capabilities ! 2) General diversity of animals ! How are animals related? ! What kinds of things animals can animals do and why are these things important? (ecology/evolution/physiology) ! Why? ! To provide a phylogenetic and functional context for discussing the “Fundamental Processes of Life” (BSCI207 - Part II) What’s are animals? What do they do?
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Animal relationships Metazoa - From where? AKA Putative Porifera from the periphery of paraphyly ! Animals have their origins among the “protists” ! In particular, Choanoflagellates ! Colonial tendency ! Sequence similarity ! Very similar to collar cells of _________! Fig. 31.11a Origin of Multicellularity What and Why? ! Multicellularity - Coordination required for some “key function” ! Boundaries fuzzy ! Why? The Pre-Cambrian Fossil record ! Life by approximately 3.5 bya ! Eukaryotes by about 2.7 bya ! Not too much diversity until about 1.2 bya ! Some examples of non-animalian multicellularity over 1 bya C&R 26.3a
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The Pre-Cambrian Fossil record ! Animals? ! Sponges and, probably, Cnidarians ! About 580 mya ! ____________ fauna ! Tough to place in modern groups ! Bilateria? ! Debate. As of 550 mya ! ________ fossils ! Possible embryos ! Some possible bilaterians Knoll/Carroll.Science 284: 2129 http://www.ucmp. berkeley.edu Cambrian Explosion ! Most modern phyla appear within about 30 million years! ! Documented at many sites throughout the world ! Review 554-57 ! What’s a Phylum? C&R 32.13 Cambrian Explosion Knoll, A. and S. Carroll. 1999.
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