20AnimalsMoveSpr11Post

20AnimalsMoveSpr11Post - Animals on the Move Goals of these...

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1 Goals of these three + lectures 1) “Tell the Tree” of animal evolution Origins, evolution of major features/capabilities 2) General diversity of animals How animals are 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) Animals on the Move Bilateria Origin of Bilateria Cephalization Preferred _________ Move through the environment Sense organs in front
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2 Origin of Bilateria Cephalization ____________ symmetry Direction Origin of Bilateria Triploblasty! A third tissue layer _______________ Forms “true” muscle Supports organs 31.3a 31.6a Relationships of Bilateria Two Great Branches of Bilaterian Tree Deuterostomes Next time Protostomes Ecdysozoa Lophotrochozoa Protosomes united by Blastopore -> ________ Relationships of Protostomia Protostomes Lophotrochozoa Platyhelminthes Annelids Molluscs Etc. etc. Ecdysozoa Nematodes Arthropods Etc. etc.
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3 Platyhelminthes - Body Plan __________ Level of Organization Like all Bilateria Unlike Porifera and Cnidaria FLAT! Acoelomate Platyhelminthes - Diversity From small to 20 m Variable lifestyles Many free-living Many parasitic With very complicated life cycles and adaptations to parasitic lifestyle (including simplification!) Platyhelminthes Form and Function Gas Exchange Flat, therefore large ________ No specialized respiratory structures Feeding Blind-ended gut Often ramifies throughout the body
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This note was uploaded on 02/01/2012 for the course BSCI 207 taught by Professor Higgins during the Spring '08 term at Maryland.

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20AnimalsMoveSpr11Post - Animals on the Move Goals of these...

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