Biology 11

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Cnidaria's Life?

Click on the jellyfish!

BY: Mariam Mahmoud

First,
What is a Cnidaria?

A cnidaria is a soft bodied animal with tentacles and stinging nematocysts.

Protection
1. Toxins - some used as antibiotics and anti-cancer drugs
2. spicules
3. regeneration

Symmetry: Radial

Detects chemicals in the water: olfactory sense like smell and taste.

THREE BODY LAYERS:
1. Epidermis
2. mesoderm= mesoglea
3. endoderm= gastrovascular cavity (the gut: mouth, no anus)
It has one opening only; mouth.

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CHOOSE YOUR CHARACTER

start by clicking on the picture to read about your chosen character

HYDROZOA

  • Habitat: fresh water

  • Internal space for digestion is the gastrovascular cavity

  • Gastrovascular cavity has one opening, the mouth

  • Exoskeleton of chitin

  • Two body forms, a polyp and medusea

  • Reproduces through budding

  • Can be deadly toxic to humans.

SCYPHOZOA

  • "True Jellyfish."

  • Spend the majority of their life cycle in medusa form.

  • Hermaphroditic, but doesn't self-fertilize.

  • Habitat: marine.

  • Has 3 layers; epidermis, endoderm, mesoglea.

ANTHOZOA

  • Polyp is the main body plan

  • Soft polyps: Anemones and some corals

  • Polyps with endoskeletons: Corals

  • Habitat: marine

  • 3 layers; epidermis, endoderm, mesoglea.

  • Sea anemone.

  • Stunts prey with nematocysts

  • Reproduction: sexual and asexual.