Key Points
Key Points: Body cavity (Coelom)
| No. | Type of Coelom | Body Cavity Formation | Examples |
|---|---|---|---|
| 1 | Eucoelomates | True coelom from mesoderm | Annelida and higher phyla |
| 2 | Acoelomates | No body cavity | Porifera, Cnidaria, Platyhelminthes |
| 3 | Pseudocoelomates | Cavity not fully from mesoderm | Aschelminthes |
Key Points: Classification Based on Body Cavity
- The body cavity (coelom) is the space between the body wall and the gut, and is important for classification.
- True coelom is lined by mesoderm, while the absence or incomplete lining leads to other types.
- Acoelomates lack a body cavity; examples include Porifera, Cnidaria, Ctenophora, and Platyhelminthes.
- Pseudocoelomates have a body cavity not fully lined by mesoderm; example: Aschelminthes.
- Coelomates have a true coelom; examples include Annelida, Arthropoda, Mollusca, Echinodermata, Hemichordata, and Chordata.
- This classification helps in understanding body organisation and the evolutionary advancement of animals.
Concepts [6]
- Systematic Position
- External Morphology
- Criteria for New System of Classification > Body Cavity (Coelom)
- Digestive System of Cockroach
- Reproduction System
- Interactions with Mankind
