Which one of the following pairs of animals comprise 'Cartilaginous fishes'?

Options

A. Labeo and Catla
B. Pterophyllum and Scoliodon
C. Pristis and Carcharodon
D. Petromyzon and Myxine

Answer

To determine which pair of animals comprises 'Cartilaginous fishes', we can follow these steps:

### Step 1: Understand the Classification of Fishes
- Fishes are primarily classified into two groups: bony fishes and cartilaginous fishes.
- Cartilaginous fishes include species that have a skeleton made of cartilage rather than bone.

### Step 2: Identify the Options Given
- The question provides several pairs of animals. We need to analyze each pair to determine if they belong to cartilaginous fishes.

### Step 3: Analyze Each Option
1. **Option 1: Labio and Catla**
- Both Labio and Catla are known as bony fishes. Therefore, this option is incorrect.

2. **Option 2: Patarophyllum and Squalidon**
- Patarophyllum is a bony fish, while Squalidon is a cartilaginous fish. Since one is bony, this option is also incorrect.

3. **Option 3: Prestice and Carcharodon**
- Both Prestice (often referred to as 'Pristis', which are sawfishes) and Carcharodon (which includes great white sharks) are cartilaginous fishes. This option is correct.

4. **Option 4: Pataromyzone and Myxin**
- Pataromyzone (often referred to as 'Petromyzon', which are lampreys) are considered cartilaginous fishes, but Myxin (hagfish) are also classified as jawless fishes and not bony fishes. However, since the question asks for a pair of cartilaginous fishes, this option is incorrect.

### Step 4: Conclusion
- The correct answer is **Option 3: Prestice and Carcharodon**, as both belong to the category of cartilaginous fishes.