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Cnidaria. Hydra, Jellyfish, Coral, & Sea Anemones. Phylum Cnidaria. Some examples of Cnidaria are: Sea anemones and Corals- Anthozoa Hydra- Hydrozoa Jelly fish- Scyphozoa Ctenophores- non stinging Cnidarians: Comb Jelly. Anatomy.

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Cnidaria

Cnidaria

Hydra, Jellyfish, Coral, & Sea Anemones


Phylum cnidaria
Phylum Cnidaria

Someexamples of Cnidaria are:

  • Sea anemones and Corals- Anthozoa

  • Hydra- Hydrozoa

  • Jelly fish- Scyphozoa

  • Ctenophores- non stinging Cnidarians:

    • Comb Jelly


Anatomy
Anatomy

A. Polymorphism- Cnidarians have more than one body form:

1. Polyp

2. Medusa


Polyp form
Polyp Form

  • Tube with tentacles

    around the mouth

  • Sessile

Coral polyp




Medusa form
Medusa Form

  • Umbrella shape

  • Tentacles around mouth

  • Motile, Free-swimming


Tentacles
Tentacles

  • Have nematocysts

    (stinging cells)

  • Coiled thread discharges

    like a harpoon

  • Contains neurotoxin

  • Paralyzes prey

Discharged nematocyst


Level of organization
Level of Organization

A. Cnidarians have tissues

B. No organs

C. Most Cnidarians have Radial Symmetry


Radial symmetry
Radial Symmetry

Radial

Compass jellyfish


Habitat
Habitat

Aquatic:

1. Most Marine

2. Few fresh-water


Feeding
Feeding

A. Carnivores

(predators)

B. Process of feeding

1. Tentacles sting prey with

nematocysts

2. Tentacles grab prey

3. Prey pulled into mouth

Lion’s mane eats another jelly


Process of feeding
Process of feeding

4. Prey stuffed into gastro-vascularcavity (GVC)*

5. GVC makes enzymes, extra-cellular digestion

6. Undigested food back out mouth

*incomplete digestive tract (no anus)



Respiration
Respiration

  • Via diffusion

  • Body is two cell layers

    thick


Internal transport
Internal Transport

  • Via diffusion


Excretion
Excretion

  • Via diffusion


Response
Response

  • No nervous system

  • Nerve net around mouth


Locomotion
Locomotion

  • Medusa- motile, free-swimming

  • Polyps- sessile,attached to hard substrate

    Exceptions:

    1. Hydra tumbles on tentacles

    2. Sea anemones glide on pedal disc


Reproduction
Reproduction

1. Asexual

budding

2. Sexual

a. Medusae release sperm & eggs

b. Larvae are free-swimming


Ecological role
Ecological Role

  • Predators and prey

  • Neurotoxins in medical research

  • Coral – jewelry, building, reefs (surfing!)

  • Coral reefs - habitat for many

    -great biodiversity

    - protect coastline

    E. Symbiosis with other organisms





























Hydra eating daphnia
Hydra eating Daphnia

  • Hydra eats Daphnia




Jellyfish1
Jellyfish

Red-eyed medusa




Jellyfish4
Jellyfish

Lion’s mane


Jellyfish5
Jellyfish

Purple lion’s mane









Portuguese man 0 war a hydrozoan not a true jelly fish
Portuguese Man 0’ War(a Hydrozoan), NOT a true jelly fish


Portuguese man 0 war
Portuguese Man 0’ War

Tentacles of Physalia physalis


Portuguese man o war vs box jelly fish
Portuguese Man o’ War vs. Box Jelly fish



Chironex fleckeri the box jelly fish
Chironex fleckerithe Box jelly fish


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