Transcript Characteristics of Phylum Cnidaria

Chapter 5 Pages 5-33 & 5-34
Coral, Anemones, Sea Fans, and Jellyfish
Characteristics of Phylum Cnidaria
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5-1
Chapter 5 Pages 5-33 & 5-34
Coral, Anemones, Sea Fans, and Jellyfish
Characteristics of Phylum Cnidaria
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5-2
Chapter 5 Pages 5-33 & 5-34
Coral, Anemones, Sea Fans, and Jellyfish
Characteristics of Phylum Cnidaria
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5-3
Chapter 5 Pages 5-33 & 5-34
Coral, Anemones, Sea Fans, and Jellyfish
Characteristics of Phylum Cnidaria
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5-4
A Nematocyst…You have to see it to
believe it.
Nematocysts firing- smarter every
day
1 Minute computer animation of Nematocyst
firing.
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5-5
Members of Phylum Cnidaria
hard corals, sea anemones, hydroids,
sea fans, jelly fish, and
siphonophores.
Chapter 5 Pages 5-33 & 5-34
Coral, Anemones, Sea Fans, and Jellyfish
 Phylum Cnidaria includes soft and
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5-6
 Anatomical characteristics include:
 They are radially symmetrical – symmetry
around a central point.
 They have a cup or bag-like body made of two
layers of cells, with tentacles around the rim.
 They have a mouth that opens into the gastrovascular cavity (a space in the middle of their
body used for digestion/reproduction).
Chapter 5 Pages 5-33 & 5-34
Coral, Anemones, Sea Fans, and Jellyfish
Characteristics of Phylum Cnidaria
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5-7
Characteristics of Phylum Cnidaria
Chapter 5 Pages 5-33 & 5-34
Coral, Anemones, Sea Fans, and Jellyfish
 They are structurally uncomplicated, with
simple nerves,muscle nets, and light
receptors.
 Colonial organisms are called polyps.
 Individuals are free-floating and are called
medusae.
 All share the ability to defend themselves
with nematocysts.
 These stinging structures are composed of
special cells called cnidocytes.
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