Which one of the following statements is incorrect?

Options

A. Mesoglea is present between ectoderm and endoderm in obelia
B. Radial symmetry is found in Asterias
C. Fasciola is a pseudocoelmate animals
D. Taenia is a triploblastic animal

Answer

To determine which statement is incorrect among the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- **Statement:** "Mesoglia is present between the ectoderm and the endoderm in ovalia."
- **Analysis:** Mesoglia is indeed a jelly-like substance found between the ectoderm and endoderm in organisms like cnidarians (e.g., jellyfish, corals). Therefore, this statement is **correct**.

2. **Analyze the Second Statement:**
- **Statement:** "Radial symmetry is found in estrioles."
- **Analysis:** Radial symmetry is characterized by body parts arranged around a central axis, and it is commonly found in organisms such as jellyfish and sea anemones. If "estrioles" refers to organisms with radial symmetry, this statement is also **correct**.

3. **Analyze the Third Statement:**
- **Statement:** "Fasciula is a pseudocelomate animal."
- **Analysis:** Fasciula, which is a genus of flatworms, is actually classified as an acoelomate, meaning it lacks a body cavity. Therefore, this statement is **incorrect**.

4. **Analyze the Fourth Statement:**
- **Statement:** "Tinea is a triploblastic animal."
- **Analysis:** Tinea, commonly known as tapeworms, are indeed triploblastic as they develop from three embryonic layers: ectoderm, mesoderm, and endoderm. Thus, this statement is **correct**.

### Conclusion:
The incorrect statement among the options provided is the third one: "Fasciula is a pseudocelomate animal."