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EVOLUTION OF ANIMALS

EVOLUTION OF ANIMALS. CHARACTERISTICS OF ANIMALS. Multicellular Eukaryotic Heterotrophic (ingestion) No cell walls Nervous & muscle tissue Sexual reproduction Hox genes. Early Embryonic Development. ANIMAL DIVERSITY BASED ON BODY PLAN. 4) Protostome/Deuterostome. 3) Body cavity.

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EVOLUTION OF ANIMALS

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  1. EVOLUTION OF ANIMALS

  2. CHARACTERISTICS OF ANIMALS • Multicellular • Eukaryotic • Heterotrophic (ingestion) • No cell walls • Nervous & muscle tissue • Sexual reproduction • Hox genes

  3. Early Embryonic Development

  4. ANIMAL DIVERSITY BASED ON BODY PLAN 4) Protostome/Deuterostome 3) Body cavity 2) Symmetry 1) Tissues

  5. SYMMETRY Anterior/posterior Dorsal/ventral Cephalization (movement) Germ layers: diploblastic/triploblastic

  6. BODY CAVITY • Acoelomate – no body cavity between digestive tract & outer wall • Pseudocoelomate – cavity not completely lined by tissue from mesoderm • Coelomate – fluid filled cavity completely lined by tissue from mesoderm • * cushions organs, allows for growth & movement • * hydrostatic skeleton (earthworms)

  7. DEVELOPMENT

  8. Phylogeny based on SSU-rRNA

  9. TROCHOPHORE LARVA ECDYSIS LOPHOPHORATE LARVA

  10. ANIMAL PHYLOGENY

  11. Porifera • (parazoans) tissues • sponges

  12. Cnidaria – gastrovascular cavity, stinging cells, polyp & medusa • Scyphozoa • jelly fish • Hydrozoa • hydra, • Portuguese man o’war • Anthozoa • coral, sea anemones

  13. LIFE CYCLE OF OBELIA

  14. CNIDARIA

  15. PLATYHELMINTHES

  16. http://ngm.nationalgeographic.com/2008/06/nudibranchs/doubilet-photographyhttp://ngm.nationalgeographic.com/2008/06/nudibranchs/doubilet-photography

  17. Polychaeta Classification: Annelida. Class: Polychaeta Characteristics: Segmented Worms that live mostly in marine environment. Have parapodia on each body segment. Motion.Gills (Blood Vessels) Examples: clam worm, lugworm, sand worm Other names: Bristle Worms Environment: marine, land, parasites Interesting Fact: Pompeii Worm is endemic to the hydrothermal vents of the Pacific Ocean. Clam Worm Parapodia --- polysaccharide chitin

  18. Fig 34-2. Chordate characteristics. All chordates possess the four trademarks of the phylum: a notochord; a dorsal, hollow nerve cord; pharyngeal slits; and a muscular, postanal tail.

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