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Placoid scales are found in...

Placoid scales are found in

A

cartilaginous fishes

B

bony fishes

C

palaentological fishes

D

Lung fishes

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Scales in Fishes**: Scales are protective structures found on the skin of various fish species. They serve multiple functions, including protection and camouflage against predators. 2. **Types of Fish Scales**: There are several types of scales found in fishes, including: - **Cycloid Scales**: These are flexible and derived from mesodermal origin. - **Tenoid Scales**: These are also found in bony fishes. - **Ganoid Scales**: Another type found in certain bony fishes. - **Placoid Scales**: These are hard, tough scales that are not flexible. 3. **Origin of Placoid Scales**: Placoid scales are derived from the dermal layer and are characterized by their rigidity. 4. **Identifying the Organism**: Placoid scales are specifically found in cartilaginous fishes, which are scientifically known as Chondrichthyes. These fishes have an endoskeleton made of cartilage rather than bone. 5. **Conclusion**: Therefore, the answer to the question "Placoid scales are found in" is **Cartilaginous fishes**. ---
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