Term
| Number of species identified? |
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Definition
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Term
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Definition
| jellyfish, sea anemones, corals, hydras |
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Term
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Definition
| A few milimeters to a few inches long |
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Term
| Largest jellyfish can be... |
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Definition
| 8 ft across, 150 ft tentacles |
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Term
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Definition
Soft-bodied
acoelomate
radial summetry (no definite front/back)
Body = hollow, 2-layered sac
2 germ layers: Ectoderm, Endoderm |
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Term
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Definition
Inner layer
Digests and absorbs food |
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Term
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Definition
Outer layer
protection, defense, feeding
contains stinging cells (cnidocytes) |
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Term
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Definition
jelly-like layer between 2 germ layers
a sac |
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Term
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Definition
Inside of Mesoglae (sac) is the GVC
connects with the outside through the mouth
digestive cavity with one opening (mouth/anus) |
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Term
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Definition
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Term
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Definition
| flower-like; tubular; sessile |
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Term
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Definition
| bell-shaped body; free floating |
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Term
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Definition
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Term
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Definition
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Term
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Definition
1) contractile tissues (act like muscle)
2) nerve net (composed of nerve cells) |
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Term
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Definition
| Cnidaria have no organs (at the tissue level of organization) |
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Term
| Muscle tissues (ectodermal) |
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Definition
run lengthwise down the body
when contracted, the body becomes short and fat |
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Term
| Muscle tissues (endodermal) |
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Definition
run circularly around the body
when contracted, the body becomes tall and thin |
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Term
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Definition
no brain
nerve net in mesoglea (concentrated around mouth/anus)
nerve net connected to sensory cells which sends signals to contractile fibers when touched |
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Term
| Herbivore, Carnivore or Omnivore? |
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Definition
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Term
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Definition
specialized cell that functions in defense and the capture of prey
contains a finely coiled fillament that is expelled when trigger is touched |
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Term
| How do the cnidocytes work? |
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Definition
Trigger is touched and filament is released
Some will inject poison (paralyze prey)
Others stick to or entangle small prey |
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Term
| Once prey is captured and paralyzed by cnidocyte |
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Definition
The tenticles force the helpless prey through the mouth into the GVC
Undigested wastes expelled (through mouth/anus)
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Term
| How to cnidarians asexually reproduce? |
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Definition
Through budding
Polyp produces medusa asexually |
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Term
| How do cnidarians sexually reproduce? |
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Definition
In unfavourable conditions: produce a spore that can remain dormant
Favourable conditions: sperm swims through water to fuse with an egg |
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Term
| Are cnidarians hermaphroditic? |
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Definition
| Most are separate sexes, some hermaphroditic |
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Term
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Definition
- small animals live among the tentacles
- corals house many organisms and protect land from wave damage |
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Term
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Definition
jellyfish is eaten/sold
Coral reefs act as a tourist attraction |
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Term
| Taxonomy: name the classes (3) |
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Definition
1 - Class Hydrozoa (ex. Hydras)
2 - Class Scyphoza (ex. jellyfish)
3 - Class Anthozoa (ex. corals, sea aneamones) |
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Term
| What is the class where the polyp form is dominant? |
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Definition
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Term
| What is the class where the medusa form is dominant? |
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Definition
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Term
| What is the class where there is only the poyp stage? |
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Definition
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Term
| How long and wide is the Great Barrier Reef? |
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Definition
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