In frog, the jaw suspensorium is

Options

A. (a) craniostylic
B. (b) autostylic
C. (c) hyostylic
D. (d) amphistylic

Answer

To answer the question about the jaw suspensorium in frogs, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Jaw Suspension Types**:
- There are different types of jaw suspensions in vertebrates, including craniostylic, autostylic, hyostylic, and amphistylic. Each type describes how the upper and lower jaws are connected to the skull.

2. **Defining Craniostylic**:
- In craniostylic jaw suspension, the upper jaw is fused to the cranium, and the lower jaw is firmly attached to the upper jaw. This is the most advanced form of jaw suspension and is found in mammals, including humans.

3. **Defining Autostylic**:
- Autostylic is a more primitive form where the upper jaw is fused to the cranium, but the lower jaw is suspended. This type is characteristic of amphibians and some fish.

4. **Defining Hyostylic**:
- In hyostylic jaw suspension, the upper jaw is loosely attached to the cranium, and the lower jaw is suspended. This type is typically found in bony fishes.

5. **Defining Amphistylic**:
- Amphistylic jaw suspension involves both the upper and lower jaws being suspended. This type is seen in sharks.

6. **Identifying the Type in Frogs**:
- Since frogs are amphibians, they exhibit autostylic jaw suspension. This means that in frogs, the upper jaw is fused to the cranium, while the lower jaw is suspended.

7. **Conclusion**:
- Therefore, the correct answer to the question about the jaw suspensorium in frogs is **autostylic**.

### Final Answer:
The jaw suspensorium in frogs is **autostylic**.

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