List two peculiar characters of phylum Aschelminthes.

Explanation

### Step-by-Step Solution:

1. **Identify the Phylum**: The question asks for peculiar characters of the phylum Aschelminthes, which is also known as Nematoda or nematodes.

2. **Character 1 - Pseudocoelomate Structure**:
- One of the peculiar characters of Aschelminthes is that they are pseudocoelomates. This means that they possess a body cavity called a pseudocoelom, which is not completely lined by mesoderm. Instead, the pseudocoelom is a fluid-filled space that separates the endoderm from the ectoderm and mesoderm. This structure is significant because it allows for the development of organ systems without the complexity of a true coelom.

3. **Character 2 - Unsegmented Body**:
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