Transcript CNIDARIA - billpalmer

ZOOLOGY
Bill Palmer
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“The Stingers”
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Includes:
Stinging Jellyfish
Hydra (freshwater)
Anemone
Coral
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Most are marine
Some are fresh water
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This phylum is named for the stinging
cells found on all members called
cnidocytes
The phylum is also called the
Coelenterates which means “hollow
gut”
They also have tentacles
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Medusa-has a bell-shaped body
Polyp-has a vase-shaped body
MEDUSA
POLYP
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Feeding
Capture prey and paralyze it with coiled
stinging cells called nematocysts
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Feeding
Inside is hollow and is called the
Gastrovascular Cavity or Coelenteron
Prey is digested in cavity and waste is
expelled through mouth
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Three Classes (about 15,000 species)
Hydrozoa-3700 species
Scyphozoa-5,000 species
Anthozoa-6,100 species
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Class Hydrozoa
3,700 species
Most in Ocean
Hydra lives in fresh water
Hydra is white or brown or dark green
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Class Hydrozoa
Hydra feeds by capturing prey as it floats
by
Prey gets tangled in tentacles
Tentacles push pray towards mouth
Reproduce by budding (asexually) in
warm times
Reproduce by sperm and egg (sexually)
in cool temps
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Hydra
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Class Hydrozoa
Some hydras are solitary; some are
colonial
Other members include:
Obelia
Physalia (Portuguese-Man-O-War)
– May be 3 ft in diameter and tentacles to 80 feet
– Sting Humans on beach-even when washed on
shore
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Portuguese Man of War
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Class Scyphozoa
About 5,000 species
Cup animals-most jellyfish
May be from ½ inch to 12 feet in
diameter
May kill people-Sea Wasp kills more
people than sharks!
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Sea Wasps (Box Jellyfish)
http://www.youtube.com/watch?v=Ws5hImeonEA
Irukandji
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Stings from jelly fish
://www.youtube.com/watch?v=R_On_
guX9WI
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Stings from jelly fish
What is best treatment for
Jellyfish sting????
Stay Safe. As always, safety is the most important step.
Jellyfish tentacles (nematocysts) may still be on the skin.
If the species is known to be box jellyfish (Chironex fleckeri)
or Irukandji (Carukia barnesi), get emergency medical help
immediately. For box jellyfish stings, vinegar may help (see
tips).
Rinse the tentacles off. Rinse away the tentacles
using hot water if possible (see step 5 for how hot). If heated
water isn't available, use salt water rather than fresh. Fresh
water may worsen the stinging pain.
Peel off the tentacles. Remove any remaining
tentacles with a gloved hand, stick, shell or tweezers. Be
careful not to get the tentacles on yourself or on clothing.
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Class Anthozoa
6,100 species
Sea anemones and corals
Sea anemones may have symbiotic
relationship with clown fish
Fish lives in tentacles and is immune to sting
Fish eats scraps of food and is protected
from predators
Anemone is kept clean of debris
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Sea Anemone
Sea Anemone
http://www.youtube.com/watch?v=o
1A5acWEERA&feature=related
http://www.youtube.com/watch?v=0TbUnFqfVvk&featur
e=related
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Sea Anemone with Clownfish
://www.youtube.co
m/watch?v=hyYW
0mr-e7k
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Class Anthozoa
Corals a small cnidarians that build reefs
Fringing reef-close to beach
Barrier reefs farther from beach-Great
Barrier Reef in Australia
Atolls-Reefs with open lagoon in middle,
may be top of a volcano-Bikini Atoll-for the
swim suit (she wore no bikini atoll)
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Brain Coral
Fan Coral
Colonial Coral
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Barrier Reefs-Fringing
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Barrier Reefs-Barrier
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Barrier Reefs-Atoll
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Barrier Reefs-Bikini Atoll
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Barrier Reefs-NO Bikini Atoll
CNIDERIA: Wrap-ups
1. List four examples of Cnideria.
2. What are the main characteristics of the
phylum Cnideria?
3. What is the difference between a medusa
and a polyp?
4. How do Cnideria feed?
5. What are the three classes of Cnideria?
Characteristics? Example?
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6. What is the common name of Physalia?
7. What is the best treatment for a jellyfish
sting? What is an urban legend for jellyfish
sting treatment?
8. What is a Irukandji? How big? Where
found? Why unusual?
9. What is a Sea Anemone? What animal
forms a symbiotic relationship[p with an
anemone?
10. Why are corals an important Cnideria?