Phylum cnidaria
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Phylum Cnidaria. Jellyfish. hydra. Coral. Sea Anemone. “True Animals” – Have tissues ( ecto and endo ) & symmetry Most live in salt water; some in fresh water. Cnidaria. Polyp: Cylindrical, pine shaped animals that are usually attached to a rock Ex. Hydra, sea anemones, corals

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Phylum Cnidaria

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Phylum cnidaria

Phylum Cnidaria


Phylum cnidaria

Jellyfish

hydra

Coral

Sea Anemone


Cnidaria

“True Animals” – Have tissues (ecto and endo) & symmetry

Most live in salt water; some in fresh water

Cnidaria


Appearance

  • Polyp: Cylindrical, pine shaped animals that are usually attached to a rock

    • Ex. Hydra, sea anemones, corals

  • Medusa: Bell shaped body; umbrella

    • Ex. Jellyfish

Appearance


Body cavity

None!

No mesoderm

Body cavity?


Muscular skeletal

Most have primitive muscle cells

Coral have external skeletons of calcium carbonate

Muscular-Skeletal


Digestion

Sac with a digestive cavity- Gastrovascular Cavity

Single opening that acts as a mouth/anus

Digestion


Digestion1

Capturing Prey- Cnidarians are carnivores (eat meat) that use tentacles arranged in a ring around their mouth to capture prey

When a trigger is stimulated on a stinging cell called the cnidocyte, a harpoon or nematocyst shoots out & injects poison into the prey

Food is pushed into the gastrovascular cavity where digestion begins (extracellular digestion)

Undigested remains leave through the mouth/anus

Digestion


Cnidocyte and nematocyst at work

Cnidocyte and nematocyst at work!

Jellyfish Video!


Nervous

Nerve Net – Cnidarians do not have a brain but they have simple sensory receptors that detect & respond to stimuli

Nervous

Circulation

  • NONE!

Respiration

  • Diffusion- Cnidarians absorb oxygen through their skin


Reproduction

  • Asexual – Budding:

    • Formation of outgrowths that pinch off from parent to live independently

Reproduction


Reproduction1

Sexual – Forms a zygote & free swimming planula that settles on ocean floor

REPRODUCTION


Excretion

One opening

Mouth/Anus – release waste

Excretion


Symmetry

Radial!

Symmetry


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