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Animals

Animals. Kingdom defined Multicellular eukaryotes that ingest Or are related to them Monophyletic line of organisms derived from choanoflagellates What do animals do? Evolutionary trends Invertebrates. Characteristics of animals.

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Animals

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  1. Animals • Kingdom defined • Multicellular eukaryotes that ingest • Or are related to them • Monophyletic line of organisms derived from choanoflagellates • What do animals do? • Evolutionary trends • Invertebrates

  2. Characteristics of animals • Multicellular eukaryotes with differentiated cells (and usually tissues and organs) • Ingestion usually into (through) a gut • Move mostly • Aerobic • Dominant phase is diploid • Development begins with larval stage • Often but not always bilaterally symmetrical with a head end

  3. Monophyletic Evolutionary paths “shaken up” by modern, molecular evidence Traditional view: Asymmetry Radial symmetry Bilateral symmetry Mouth development Endoskeleton Evolutionary trends Sponges Starfish & vertebrates Worms & bugs Jellyfish

  4. Sponges 1

  5. Aggregated community of cells Collar cells Filter feeders Sponges 2

  6. Cnidarians 1

  7. Radial symmetry Tissue level of development Sting cells Gastrovascular cavity Often alternate between two phases: Polyp Medusa Cnidarians 2

  8. Cnidarians 3

  9. Cnidarians 4 Hydrapolyp feeding Jellyfish medusa moving

  10. Flatworms 1

  11. Bilaterally symmetrical Cephalization Gastrovascular cavity “Solid” body Muscles Cilia Flatworms 2

  12. Flatworms 3 Tapeworms – intestinal parasites

  13. Round worms 1

  14. Bilaterally symmetrical Complete gut Longitudinal muscles Rigid cuticle Round worms 2

  15. Rotifers 1 • Related to round worms • Mouth ringed by cilia • Forked tail

  16. Rotifers 2

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