Classification
- The main feature used in animal clasification is the presence or absence of a back bone (vertebral colum).
- The animals which have a vertebral column are Vertebrates, which the animals which do not have a vertebral column are Invertebrates.
Invertebrates
- Some of the phyla among invertebrates are indicated below.
2 . Annelida
3. Mollusca
4. Arthropoda
Coelenterata
 |
| Sea anemone |
- Hydra, Jelly fish, Sea anemone and coarls are some organisms which belong to this phylum. Some of the main feature of Coelenterates;
2. Has a radial symmetry.
3. Diploblastic-body comprises with two layers of cell
4. live in water
Annelida
 |
| Leech |
- Warth worms, Leechs and Rag worm can be cited as some examples of this phylum. Main features of Annelides can be summarized can be follows;
2. Has a bi-lateral symmetry
3. Prefer to live in wet environments.
4. Possess a coelom.
Mollusca
 |
| Octopus |
- Sanil,Cuttlefish, Octopus and Slugs are some organismsms that belong to the phylum mollusca.Some of main feature of these organisms are given below.
2. Live in wateras well as on land
3. Wet slimy body covering
Arthropoda
 |
| Prawn |
- Arthropods are considered as the most succesful group among animals. This group contains the most of the world's species of organisms. This amount is considered around 75% or more. Some of the maine features of Arthropods are mantioned below.
2. Segmented body.
3. Live in water as well as on land.
4. Possess a hard chitinous exoskeleton.
