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Invertebrates 1 (Platyhelminthes (2 major life forms (Parasitic flatworms…

- - - - suckers/hooks to attach to host intestines
      - no gastrovascular cavity at all--> no mouth--> absorb nutrients across body surface
      - adults inhabit vertebrates
    - - hermaphrodites
      - asexual reproduction through fission (cut one in half, tissue regeneration, 2 planarians!)
      - light sensitive eyespots that can see outlines, not details
- - - - Polyp stage more conspicuous
      - Hydras only exist in polyp form
  - - - moves freely in water
      - either passive drifting or contractions of cavity
      - jelly-fish type shape
    - - largely sessile
      - sea anemones
      - cup right side up
- - - - no distinct head, no radula
      - mantle cavity contains gills for feeding and gas exchange
      - shell laterally divided into two hinged halves
      - some have eyes and sensory tentacles along outer edge of mantle
      - all aquatic (think clams and oysters)
    - - Shell reduced or internal
      - closed circulatory system
      - water expelled from mantle cavity for movement
      - Well developed sensory organs (like a brain)
      - Marine predators that use tentacles to grasp prey
      - eyes are extremely similar to human eyes
      - unusual body plan: body, head, then legs
    - - Head with eyes on tentacles
      - use radula to graze algae (herbivores) or bore holes (carnivores)
      - Aquatic gastropods have gills, terrestrial use lining of lungs for gas exchange
      - most have single spiral shell