Marine 2 21-12
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Marine 2 21-12

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    Marine 2 21-12 Marine 2 21-12 Presentation Transcript

    • Marine Worms Flatworms, Annelids, & Polychaeates
    • Evolution in progress!!
      • Going from sponges
        • Multi cellular
          • No sensory organs
          • No locomotion
          • No cognitive functioning
          • No organs
        • Sessile
        • Asymmetrical
    • To Worms!
      • organ level of organization!
        • What organs did you find in the worksheet?
      • Bilateral symmetry
      • Cephalization
        • Beginnings of a brain
      • Locomotion
      • Active predators
    • Phylum platyhelminthes Class turbellaria
    • Flatworms!
      • Cephalization
        • Can detect light, chemicals, and movement
      • Locomotion
        • Covered with a layer of cells called the epidermis
        • Ventral surface of epidermis produces mucus
    • Flatworms
      • Digestion:
        • Heterotrophs
          • Crustaceans, snails, annelid worms
          • Bodies of dead animals
          • Diatoms
            • Why is it more beneficial to eat diatoms?
    • Active predators
      • Entangle prey in mucus
        • Suffocates
      • Stab prey with a pharynx
        • Pumps out enzymes
        • Sucks out body fluids
      • Gastrovascular cavity
        • What do the branches in the cavity do for the organism?
    • Flatworms
      • Reproduction
        • Asexually and sexually
          • regeneration
      • Reciprocal copulation
        • Hermaphrodites
        • Exchange both sperm and egg
    • Tapeworms
      • Parasitic
        • Live in digestive tract
        • Can be huge
      • No digestive tract or nervous tissue
      • Passed through intermediate hosts
        • Can be deadly
      • Attach to host using a scolex
    • Phylum Annelida
      • Segmented worms
    • Annelids
      • Worms whose bodies are divided internally and externally into segments
      • Heterotrophs
        • Take in nutrients from the soil
        • help to filter nutrients
    • Structure of annelids
      • Bilateral
        • Fluid filled: hydrostatic skeleton
      • Longitudinal and circular muscles to help with locomotion
      • Setae:
        • bristles on skin that help movement
      • Cerebral ganglia
      • Gas exchange occurs across the skin
    • Digestion
      • Food enters body through the pharynx
        • Organic nutrients are digested in the intestine
      • Nutrients are stored in the crop
      • Help to filter nutrients in the soil
    • Class polychaetes
    • Tube like worms
      • Live in sand mud, corals, shells
      • Bury themselves in the sand and project only their jaws or tentacles out of their tubes
    • Structure
      • Light sensors
        • pull themselves back in their tubes
      • Tentacles
        • Use cilia to strain food and release wastes
      • Tubes
        • Protective
        • Made of calcium, carbon,
        • Structure
    • Digestion
      • Digestive tract running straight through
        • Usually two openings
        • Or turn themselves inside out to release wastes
    • Reproduction
      • Asexual:
        • regeneration, budding
      • Sexual:
        • Epitoke: pelagic reproduction
          • Release millions of sperm and eggs all in one night
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