All of them are characteristics of urochordates, except

Options

A. Neural gland as excretory organ
B. Open type of circulatory system
C. Cranium is absent
D. Development is direct

Answer

To solve the question regarding the characteristics of urochordates, we will analyze each option provided and determine which one does not belong to the characteristics of urochordates.

### Step-by-Step Solution:

1. **Understanding Urochordates**: Urochordates, also known as tunicates, are a subphylum of the phylum Chordata. They exhibit certain key characteristics that distinguish them from other chordates.

2. **Reviewing Characteristics**:
- **Neural Gland and Excretory Organs**: Urochordates possess a neural gland, pyloric gland, and nephrocytes that function as excretory organs. This characteristic is true for urochordates.
- **Open Circulatory System**: Urochordates have an open type of circulatory system, which is also a correct characteristic.
- **Absence of Cranium**: Urochordates are referred to as acrania, meaning they lack a cranium. This is another true characteristic.
- **Development Type**: Urochordates undergo indirect development, which includes a larval stage (tadpole stage). This means they do not have direct development.

3. **Identifying the Incorrect Characteristic**:
- The statement regarding development being direct is incorrect. Urochordates have indirect development, so this characteristic does not apply to them.

4. **Conclusion**: Based on the analysis, the characteristic that does not belong to urochordates is that their development is direct.

### Final Answer:
The characteristic that is NOT true for urochordates is that their development is direct.

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