CNIDARIA ARE A GROUP OF ANIMALIA WHICH REPRESENT DISTINCT FEATURES SCIENTISTS USE THEM IN THEIR RESEARCHES FOR EXAMPLE THEY USE HYDRA FOR REGENERATION OR STEM CELL RESEARCHES

1. Zoology laboratory guide
Dr. Afagh Bapirzadeh
First semester 1402
Rat dissection view
fish dissection view
frog dissection view
mollusca
porifera
protozoa
cnidaria
Platyhelminthes

2. Main kingdoms of life

3. Cnidarian Main
Features
Multicellular animals
which exist as free-swimming
medusae or stationary polyps
Cnidarian have tentacles
which exhibit organelles
called nematocysts
Cnidarians have radial
symmetry
All cnidarians are carnivores
They have sexual /asexual
reproductive phases

4. Symmetry
Of
Cnidaria

5. Cnidaria Parts

7. • Freshwater multicellular predatory
organism
• It has tubular body with tentacles
• Eats worms, larva and invertebrates
• It has regenerative properties
(suitable for stem cell researches )
• Hydra reproduction is mainly by
asexual budding process
Hydra Specific Characteristics

8. Hydra Real Image

9. Obelia
• Its other name is sea fur
• It consist hydroid colony
• It comprises vertical branching stems
known as hydrocauli and root-like
branches known as hydrorhiza
• Life cycle of both asexual and sexual
generations
• Obelia’s life cycle alternates between
hydroid and medusoid phases on a
regular occasion

10. Obelia

11. Obelia Real Images

12. Jellyfish
• Other name is sea jellies
• Free-swimming marine animals
• Jellyfish are eaten by humans in certain cultures
• used in research for green fluorescent protein of them which
cause bioluminescence as a fluorescent marker for
genes inserted into other cells or organisms.
• They have a central bell and multiple lengthy tentacles
• Jellyfish consume their prey using stinging cells called
nematocysts.

13. Scyphistoma life cycle

14. Nematocysts
of
jellyfish