Zoology Lecture 8

  1. How are amphiblastula larva formed?
    they are formed from a round thing of cells the cells grow some flagella and then the round thing of cells inverst so that the flagella face outwards instead of inwards
  2. Cnidarians just saying
  3. sponges are looked at the level of cell what level do we consider cnidarians?
    the tissue grade
  4. What significant feature on earth are cnidarians responsible for
    the construction of coral reefs
  5. About 9,000-10,000 extant species of _______, ________, __________ and their relatives are described.
    • jellyfish
    • corals
    • anemones
  6. define dipoblasty
    Diploblasty is a condition of the ovum in which there are two primary germ layers: the ectoderm and endoderm. Diploblastic organisms are organisms which develop from such an
  7. what do the ectoderm and endoderm become in the adult
    epidermus and gastrodermis
  8. What are these two layers epidermus and gastrodermis seperated by
    these two layers are seperated by an ectodermally derived acellular mesoglea
  9. what kind of symetry do cnidarians show
    radial symetry
  10. define oral-aboral
    and is termed the oral, or anterior, end, and the other of which, called the aboral, or posterior, end, forms the rear end of the animal and may bear the anus. The main axis is hence termed the oral-aboral, or anteroposterior, axis. Except in animals having an odd number of parts arranged in circular fashion (as in the five-armed
  11. Possess unique stinging or adhesive organelles called _______; each cnidais produced in a cell, the ________. The most common cnidaeare ________.
    • cnidae
    • cnidocyte
    • nematocysts
  12. What does the gastrovascular cavity serve as
    Both the mouth and anus
  13. A diffuse _______ system structured as simple nerve nets, comprised of _______ and largely non-polar ______.
    • nervous
    • naked
    • neurons
  14. What do cnidarians show think AoG but the fancy term for it
    Metagensis -The phenomenon in which one generation of certain plants and animals reproduces asexually, followed by a sexually reproducing generation. Also known as alternation of generations.
  15. Typically have ________ larvae (ciliated, motile, gastrula larvae).
  16. Fig 6.4 and 6.5 described
    • 6.4 is a of a hydra which looks lke a bowling pin with tentacles at the top
    • 6.5 is a medussa which looks like a jellyfish with extremly stubby stinger tentacles
    Class-Scyphozoa, Cubozoa, Hydrozoa,
    SUBPHYLUM – Class Anthozoa Class Myxozoa(unranked)
    Just saying
  18. What is our approach to cnideria?
    discusss on a class-by-class basis
  19. Hydrozoa just saying
  20. Are there any colonial species in hydrozoa?
    Yes many colonial species in hydrozoa
  21. Oblea (species) just saying
  22. Obeliahas both well developed _____ and _____ phases.
    • polyp
    • medusa
  23. Polyps are _______ with _________ polymorphism
    • colonial
    • secondary
  24. Polyps grow as bushy (________) colonies on marine algae and drift wood
  25. Colonies consist of root-like __________ and stem-like ____________.
    • hydrorhiza
    • hydorcaulus
  26. Obeliasp. hydrocaulus Made up of living tissue (_______ and ______ ) that secrete a chitinous ________ (hydrotheca, gonothecaand perisarc)
    • polyps
    • coenosarc
    • exoskeleton
  27. Body hollow cylinder – ___________ _________
    • gastrovascular
    • cavity
  28. In hydrozoans the gastrovasculardoes not extend into tentacles but ______________ do
    gastrodermal cells
  29. What is the Outer tissue layer called
  30. Middle jelly-like layer –
  31. Inner tissue layer is the ______________
  32. Refering to Hydraactinia a colony that looks like plant with a stem and bulbs at the top. They are known as what (related to body or lack of)
    Athecate colony meaning no-body
  33. What is a gonozooid
    Gonozooid - A sexual zooid, or medusoid bud of a hydroid; a gonophore.
  34. What is a gastrozooid
    Gastrozooid A nutritive polyp of colonial coelenterates, characterized by having tentacles and a mouth.
  35. What are dactoylzooids
    • Some colonies possess
    • dactylozooids, tentacleless polyps heavily armed with nematocysts that
    • seem primarily concerned with defense.
  36. Millepora, a hydrocoral just saying
  37. What are millepora also known as?
    Fire corals
  38. __________ secretes a CaCO3(aragonite) skeleton
  39. What two -zooids does millepora share with hydractinia in common? doesnt acutally "share" but ahs the same thing
    • Gastrozooid
    • dactylzooid
  40. Obeliamedusa jsut saying
  41. What does obelia medusa "look" like?
    looks like a shallow umbrella fringed with tentcles
  42. Convex outer surface – ____________
  43. Concave inner surface – ______________
  44. Define vellum in relation to obelia
    Velum - the circular membrane around the cap of a sea jelly or medusa, which helps with propulsion
  45. Obeliahas a craspedotemedusa because of the _______
  46. Mouth opens at end of ____________
  47. Manubriumcontains the _____________
    gastrovascular cavity
  48. The cavity extends through the umbrella as ___________ that are connected together at the ___________ as the ring canal.
    • four radial canals
    • margin of the bell
  49. Four gonads lie in the ___________ epidermis beneath the ________.
    • subumbrella
    • ring canals
  50. Where does the medusa come from?
    Froma hydroid colony (the thing with a gastrodermis, the medusa release fertilized eggs which become the planula which becoems a young hydroid colony which becomes a mature hydroid colony which becomes a mature hydroid colony
  51. End
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Zoology Lecture 8
Zoology Lecture 8