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Intro to invertebrates tz sp15

Introduction to Invertebrates

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Intro to invertebrates tz sp15

  1. 1. Shared Animal Characteristics Multicellular  Most have tissues and organs Aerobic heterotrophs Reproduce sexually Develop from embryos Motile Today we will focus on invertebrates  No internal backbone Compare similarities and differences through several basic features
  2. 2. Symmetry Radial symmetry: body parts arranged around a central axis Bilateral symmetry: have a front and back end and right and left side
  3. 3. Embryo Tissue Layers Zygote develops into a mass of cells Primary tissue layers form  Simple radial animals have two layers  Outer ectoderm  Inner endoderm  Bilateral animals have a third layer, mesoderm in the middle
  4. 4. Pattern of Development Protostome: first embryo opening becomes the mouth  Examples: flatworms, molluscs, roundworms, arthropods Deuterostome: second embryo opening becomes the mouth  Example: Echinoderms, chordates
  5. 5. Body cavity: Coelom Cavity between the gut and the wall that is lined with tissue  Cushions organs  Helps organs grow and move independently 3 types of body cavities
  6. 6. Acoelomate: no body cavity  Flatworms Pseudocoelmate: false cavity  Partially lined  Roundworms Coelomate: true cavity Higher animals
  7. 7. Animal Phylogenetic tree
  8. 8. Sponges: Phylum Porifera No true tissues No germ layers Acoelomates No symmetry Sessile adult Asexual and sexual reproduction Spicules: made of different substances; for protection Collar cells (choanocytes)-flagellated, create water currents Amoebocytes-digestion, secretion Epidermal cells-cover surface Osculum: largest opening for water
  9. 9. Grantia slide
  10. 10. Jellyfish Phylum Cnidaria Radial Symmetry Two germ layers Simple tissues Acoelomates Polyp and/or medusa stage Stinging cells—Cnidocytes with nematocysts  Fluid filled capsule with thread Nerve net
  11. 11. Hydra-cnidarian example Look at slides and live specimens
  12. 12. Roundworms: Phylum Nematoda Bilateral symmetry Three germ layers Molt their cuticle Pseudocoelomates Cephalization with brain Complete digestive system (2 openings) Many parasites
  13. 13. Roundworm examples Ascaris: intestinal parasite, infects humans Trichinella: encysts in human muscles causing trichinosis Vinegar eels: live specimen
  14. 14. Three germ layers Coelomates Bilaterally symmetrical Jointed appendages Exoskeleton with chitin Specialized segments Cephalization Phylum Arthropoda
  15. 15. Arthropod Lineages Trilobites (all extinct) Crustaceans (crabs, shrimps, barnacles) Chelicerates (spiders, mites, scorpions) Uniramians (insects, centipedes, millipedes) Today: dissect a crayfish
  16. 16. Wear goggles, gloves, and lab coats Carosafe safety procedures Put specimens in correct containers  No gloves or paper towels with tissue waste No unauthorized dissections-please treat specimens with respect Clean all dissection equipment at conclusion Important Dissection Notes

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  • mansournashaat

    Oct. 18, 2017
  • LibelRigelion

    Sep. 27, 2018

Introduction to Invertebrates


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