Jaw suspension of mammals is

Options

A. Amphistylic
B. Craniostylic
C. Autodiastylic
D. Hyostylic

Answer

### Step-by-Step Solution:

1. **Understanding Jaw Suspension**:
- Jaw suspension refers to how the lower jaw (mandible) is attached to the upper jaw (maxilla) or the skull. This attachment is crucial for the mechanics of feeding and is different across various animal groups.

2. **Analyzing the Options**:
- **Option 1: Amphistylic**: This type of jaw suspension is found in some primitive fish, where the jaw is made of cartilage and has no modifications. Therefore, this is not applicable to mammals.

- **Option 2: Carinostylic**: This is the correct type of jaw suspension for mammals. In mammals, the upper jaw (derived from the trigeminal cartilage) transforms into the incus and alisphenoid, while the lower jaw (derived from Meckel's cartilage) transforms into the malleus. The jaw directly attaches to the skull at the squamosal bone.

- **Option 3: Autodiastylic**: This type is characterized by the presence of the quadrate bone connecting to the lower jaw, which is not the case in mammals. This type is more typical of some reptiles.

- **Option 4: Hyostylic**: This type of jaw suspension is found in sharks, where the pterygoquadrate connects to the lower jaw. It is not relevant to mammals.

3. **Conclusion**:
- After analyzing all the options, the correct answer is **Carinostylic**, which is the type of jaw suspension found in mammals.

### Final Answer:
The jaw suspension of mammals is **Carinostylic**.

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