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What symmetry do organisms in this phylum have?
Radial
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Cnidocytes
Stinging cells
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What level of organization are these organisms?
Tissue
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Polyp Body Type
Attached and sessile
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Medusa Body Type
Free-swimming
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How many embryonic layers does this phylum have?
Two (diploblastic): endoderm and ectoderm
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Triploblastic
Three embryonic layers: endoderm, ectoderm and mesoderm
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Incomplete Gut
- Formed by endoderm.
- There is only one opening that serves as both the mouth and the anus.
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Gastrovascular Cavity
Functions as both the digestive system and the transport system.
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Mesoglea
Glycoprotein holding the tissues together.
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What are the three main classes of cnidaria?
- Hydrozoa
- Scyphozoa
- Anthozoa
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Hydrozoa
- Go through both polyp and medusa stages.
- Medusae have velum, which is a shape-holding ring of tissue at the bottom of the exumbrella.
- Ex: Obelia
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Scyphozoa
- Medusa stage only.
- Ex: Aurelia
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Anthozoa
- Polyp stage only.
- Solitary or colonial.
- Ex: Metridium
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Name the parts of this image of Aurelia:
Oral Arms
Mouth
Gonads
Tentacles
Cnidocytes
Exumbrella
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Nematocysts
Filamentous organelles that are expelled from cnidocytes.
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On the picture of the Aurelia life cycle, label the:
Strobila
Strobilates
Ephyras
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In the picture of Aurelia Ephyra label:
Rhopalia
Define ocellus and statcyst.
- Ocellus: light sensation
- Statocyst: gravity sensation
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What are polyp colonies called?
Hydroids
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In the Obelia picture, label (and define):
Coenosarcs
Hydranth
Gonangium
- Hydranth: Feeding polyp
- Gonangium: Reproductive polyp
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Hermatypic
Corals that harbor symbiotic algae.
Small polyps, create huge coral reefs because they house their own food supply.
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Ahermatypic
Corals that do not house ay photosynthetic symbionts.
Larger polyps.
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