Jellyfish and Sea Anemones

  1. Gastrovascular Cavity
    Incomplete gut, one opening for mouth and anus
  2. Complete Gut
    1 opening for mouth and 1 for anus
  3. True Tissue
    Multiple cell types forming a coordinated function, ex: organ
  4. Diploblastic
    2 cell layers: ectoderm and endoderm
  5. Epidermis
    Outermost layer of skin on organisms
  6. Gastrodermis
    Layer of cells that lines the gastrovascular cavity in cnidarians (jellyfish, etc)
  7. Triploblastic
    3 layers of cells: ectoderm, mesoderm, and endoderm
  8. Mesoderm
    Middle layer of cells, in between ectoderm and endoderm
  9. Endoderm
    Innermost layer of cells
  10. Epithelio-Muscular Cells
    whose bodies form part of the epithelium but whose bases extend to form muscle fibers in parallel rows

    epithelium-the thin tissue forming the outer layer of a body's surface and lining the alimentary canal and other hollow structures
  11. Nerve Net
    (in invertebrates such as coelenterates and flatworms) a diffuse network of neurons that conducts impulses in all directions from a point of stimulus
  12. Cnidocytes
    an explosive cell containing one giant secretory organelle or cnida (what makes them sting)
  13. Nematocysts
    a specialized cell in the tentacles of a jellyfish or other coelenterate, containing a barbed or venomous coiled thread that can be projected in self-defense or to capture prey
  14. Tentacles
    a slender flexible limb or appendage in an animal, esp. around the mouth of an invertebrate, used for grasping, moving about, or bearing sense organs
  15. Polyp
    columnar body with the mouth uppermost surrounded by a ring of tentacles ex: sea anemone
  16. Medusa
    umbrella-shaped body with stinging tentacles around the edge
  17. Coral Reef
    the skeletons of old coral and it just piles on top of each other to form a huge coral reef
  18. Planula larval stage
    planula is a free swimming larvae and then it settles and becomes a polyp and then possibly a medusa
  19. Stobila
    a stack of immature larval jellyfish formed on a sessile polyplike form by sequential budding
  20. Colloblasts
    adhesive cells made by ctenophores (comb jellies)
  21. Comb row (ctene)
    ciliated combs (little hairs on the tentacles)
  22. Cnidaria Synapomorphies
    • Cnidocytes- nematocysts (stinging structures)
    • Gastrovascular cavity
    • Mouth surrounded by tentacles
    • Medusa body form
    • Planula Larvae
  23. Cnidarian Diversity
    Phylum Cnidaria
    • "Hydrozoa"- Hydroids, Portuguese Man of War
    • Scyphozoa- Larger "true" jellyfishes
    • Cubozoa- Cube jellyfishes
    • Anthozoa- Anemones, Coral, Sea fans, etc
  24. Ctenophora Characteristics
    (Comb Jellies)
    • Marine
    • 8 plates of ciliated combs (ctenes)
    • Feeding tentacles with colloblasts (instead of stinging cells, it releases a sticky substance)
    • Luminescent, fragile
Card Set
Jellyfish and Sea Anemones
Bio 101 lecture 7 vocab and key ideas