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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
Portuguese Man 0’ War

Tentacles of Physalia physalis

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