Ascon type of canal system is found in

Options

A. grantia
B. Leucosolenia
C. hyalonema
D. euspongia

Answer

### Step-by-Step Solution:

1. **Identify the Phylum**: The question asks about the Ascon type of canal system. The Ascon type is found in the Phylum Porifera, which includes sponges.

2. **Understand the Canal Systems**: In the Phylum Porifera, there are three types of canal systems:
- Asconoid (simplest)
- Syconoid (more complex)
- Leuconoid (most complex)

3. **Define the Ascon Type**: The Ascon type of canal system is characterized by a simple structure where water flows directly into the central cavity (spongocoel) through small openings called ostia and exits through a larger opening called the osculum.

4. **Identify Organisms with Ascon Type**: The organism that exhibits the Ascon type of canal system is **Leucosolenia**. This sponge has a simple body structure that allows water to flow in and out efficiently.

5. **Conclusion**: Therefore, the Ascon type of canal system is found in **Leucosolenia**, which is a member of the Phylum Porifera.

### Final Answer:
The Ascon type of canal system is found in **Leucosolenia**.

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