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Abstract
Hagfishes, lampreys, cartilaginous fishes, and lungfishes possess a level of visual complexity that is almost unrivalled in other vertebrates.
- The relationship between an animal's visual system and its environment is essential for understanding adaptation and evolution.
- Different species exhibit a variety of visual characteristics optimized for their specific ecological niches.
- A comprehensive understanding of visual system design in vertebrates requires knowledge of the basic structure of key representatives from each taxon.
- Photoreception in early vertebrates is explored through various neurobiological methods.
- These early vertebrates are crucial for studying evolutionary stages and visual system development.
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