Which phylum of animals posses pseudocoelomic type of body cavity?

Answer

To answer the question "Which phylum of animals possesses pseudocoelomic type of body cavity?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Pseudocoelom**:
- A pseudocoelom is a type of body cavity that is not lined by mesodermal tissue. Unlike a true coelom, which is completely surrounded by mesoderm, a pseudocoelom is a fluid-filled space between the endoderm and mesoderm.

2. **Identifying the Relevant Phylum**:
- The phylum that is known for having a pseudocoelomic body cavity is **Aschelminthes**. This phylum includes organisms commonly referred to as roundworms.

3. **Characteristics of Aschelminthes**:
- Organisms in this phylum are triploblastic, meaning they have three germ layers: ectoderm, mesoderm, and endoderm.
- They exhibit bilateral symmetry, which means their body can be divided into mirror-image halves along one plane.

4. **Conclusion**:
- Therefore, the phylum of animals that possesses a pseudocoelomic type of body cavity is **Aschelminthes**, also known as roundworms.

### Final Answer:
The phylum of animals that possesses a pseudocoelomic type of body cavity is **Aschelminthes** (roundworms).

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