Coelenterates are aquatic, mostly marine.

1. Dr. BGR
COELENTERATA

2. AGENDA
Introduction
General characteristics
Summary

3. SCIENTIFIC CLASSIFICATION
KINGDOM: ANIMALIA
Note
All animals are members of the Kingdom Animalia

4. HABITAT
AQUATIC
MOSTLY MARINE
Note
Habitat: Natural Environment of an Organism
Aquatic: Relating to water
Marine: Found in the sea

5. HABIT
 SOLITARY / COLONIAL.
 EACH INDIVIDUAL IS KNOWN AS ZOOID.
Habit: Behavior
Zooid: A single animal that is part of a colonial animal.
Note

6. SYMMETRY
RADIALLY SYMMETRICAL
Symmetry: the repetition of the parts in an animal
Note

7. GRADE OF ORGANIZATION
TISSUE GRADE OF ORGANIZATION

8. GERM LAYER
DIPLOBLASTIC: OUTER ECTODERM & INNER ENDODERM.
MESOGLOEA SEPARATES THESE TWO LAYER
Germ layer
endoderm
(inner layer)
ectoderm
(outer layer)
mesoderm
(middle layer)

9. COELOM
GASTROVASCULAR CAVITY / COELENTERON.
Note
Coelom
 Principal body cavity
 located between the intestinal canal & the body wall.

10. NEMATOCYST
 ORGAN FOR CAPTURING & PARALYZING PRAY
 PRESENT IN TENTACLES
Dr. BGR
Nematocyst: a specialized cell
Note

11. NUTRITION
HOLOZOIC (ANIMAL LIKE)
Dr. BGR
Nutrition
 biochemical & physiological process
 organism uses food to support its life
Note

12. DIGESTION
IS BOTH INTRACELLULAR & EXTRACELLULAR.
Digestion: takes place in the body cavity which is the coelenteron.
Dr. BGR
Note

13. RESPIRATION
BY SIMPLE DIFFUSION.

14. EXCRETION
BY SIMPLE DIFFUSION
No anus.
Dr. BGR
Note

15. CIRCULATORY SYSTEM
ABSENT

16. NERVOUS SYSTEM
POORLY DEVELOP

17. REPRODUCTION
 ASEXUAL: BY BUDDING
 SEXUAL: BY GAMATIC FUSION

18. FERTILIZATION
INTERNAL / EXTERNAL
Dr. BGR
Fertilization: Union of two haploid gametes
Note

19. DEVELOPMENT
INDIRECT WITH LARVAL STAGE
Dr. BGR

20. MORPHOLOGICAL FORMS
• THESE ORGANISMS SHOW TWO MORPHOLOGICAL FORMS – POLYPS & MEDUSA.
•Polyps contain exoskeleton and endoskeleton.
•Asexual reproduction: seen in polyps, through budding
•Sexual reproduction: seen in medusa form, through gametic
Note

21. EXAMPLE
HYDRA, RHIZOSTOMA, XENIA.
Physalia, Halistemma, Stephalia
Sea Anemones
obelia
Aurelia (Jellyfish)

22. THANK
YOU