Cnidaria
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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

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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


Polyp sea anemone

Polyp (sea anemone)


Polyp hydra

Polyp (Hydra)


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)


Lion s mane jellyfish eating

Lion’s mane jellyfish eating


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


Class anthozoa sea anemones

Class Anthozoa: Sea Anemones


Sea anemones with sea urchins

Sea Anemones (with sea urchins)


Sea anemones clown fish with sea anemone

Sea Anemones Clown fish with sea anemone


Clown fish eggs with sea anemone

Clown fish & eggs with sea anemone


Clown fish with sea anemone

Clown fish with sea anemone


Giant sea anemone

Giant Sea Anemone


Rosy sea anemone

Rosy Sea Anemone


Class anthozoa corals

Class Anthozoa: Corals


Brain coral

Brain Coral


Coral

Coral


Colt coral

Colt Coral


Elkhorn coral

Elkhorn Coral


Cabbage coral

Cabbage Coral


Flower coral

Flower Coral


Feather coral

Feather Coral


Gorgonian fan coral

Gorgonian Fan Coral


Lamellina coral

Lamellina Coral


Sun coral

Sun Coral


Subergorgia coral

Subergorgia Coral


Soft coral

Soft Coral


Sea pen

Sea Pen


Sea fan

Sea Fan


Sea plume

Sea Plume


Class hydrozoa green hydra

Class Hydrozoa: Green Hydra


Hydra

Hydra


Brown hydra with buds

Brown Hydra with buds


Brown hydra eating

Brown Hydra eating


Hydra eating daphnia

Hydra eating Daphnia

  • Hydra eats Daphnia


Class scyphozoa true jellyfish

Class Scyphozoa: True Jellyfish

Fried egg jelly


Jellyfish

Jellyfish


Jellyfish1

Jellyfish

Red-eyed medusa


Jellyfish2

Jellyfish


Jellyfish3

Jellyfish


Jellyfish4

Jellyfish

Lion’s mane


Jellyfish5

Jellyfish

Purple lion’s mane


Upside down jelly fish

Upside down Jelly fish


Upside down jelly fish1

Upside down Jelly fish


Sea nettle

Sea Nettle


Jelly and diver

Jelly and diver


Giant jelly off coast of japan

Giant Jelly off Coast of Japan


Beached jelly fish

Beached Jelly fish


Jelly fish humor

Jelly fish Humor


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


Class cubozoa box jellyfish

Class Cubozoa: Box Jellyfish


Chironex fleckeri the box jelly fish

Chironex fleckerithe Box jelly fish


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