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
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
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
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
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.