Describe with the help of suitable diagrams the integument of primitive fishes.

The integument of primitive fishes, which includes the skin and its associated structures, plays a significant role in their protection, respiration, and sensory perception. Primitive fishes, such as jawless fishes (agnathans) and early jawed fishes (gnathostomes), display a variety of integumentary features that differ from those found in more advanced groups. The integument of primitive fishes is primarily composed of epidermis, dermis, and the presence of various scales and mucus glands that help in survival in aquatic environments.

### Epidermis

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