Phylum Cnidaria

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Phylum Cnidaria
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Phylum Cnidaria

• Characteristics
• Aquatic (most marine)
• - Radial Symmetry
• Have true tissues but not organs
• Mostly carnivorous
• Tentacles with stinging nematocysts

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Cnidarian Body The Polyp
Mouth
Tentacle
Epidermis
Column
Mesoglea
GastrovascularCavity
Gastroderm
Foot
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Cnidarian Body The Medusa
GastrovascularCavity
Epidermis
Mesoglea
Tentacle
Gastroderm
Mouth
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Cnidarian WeaponryThe Nematocyst
Trigger
Filament
Nuclei
ArmedNematocyst
BodyWall
SpentNematocyst
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Gastrovascular Cavity

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Hydra Eating a Daphnia
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Nerve Net
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Hydrostatic Skeleton
alternating
Circular Muscles
Longitudinal Muscles
Hydrostatic Skeleton
longitudinal
circular
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Class Hydrozoa

• - Hydra budding

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Class Hydrozoa
Obelia hydroid colony with feeding (tentacles)
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Class Hydrozoa

• - Portuguese man-of-war

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Class Scyphozoa

• - Moon Jelly
• - medusa form

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Class Scyphozoa

• Sea Nettles

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Class Scyphozoa

• - Sea Wasp or Box Jellyfish

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Class Anthozoa

• - sea anemone

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Class Anthozoa

• - sea anemone

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Class Anthozoa

• - sea anemone

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Class Anthozoa

• - reef coral

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Class Anthozoa

• - sea pen

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Class Anthozoa

• - sea fan

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Observing a Hydra

• Obtain a prepared slide of Hydra
• Look at the Hydra under the microscope
• Draw the hydra in the drawing section of the
  Cnidarian lab sheet underneath the Portugese man
  of war or on the back of the lab sheet

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Portuguese Man of War

• Observe the following footage of a Portuguese man
  of war. On your lab sheet compare them to the
  true jellyfish.
• http//www.youtube.com/watch?vRBdCpcapB0s