The Devonian period is frequently called the__________, a period that witnessed the explosive radiation of fishes with jaws.

Devonian Period

refers to a period in the Paleozoic Era, approximately 419.2 to 358.9 million years ago, known for significant diversification of life, especially in marine environments.

Radiation of Fishes

The diversification of fish species over time and environments, leading to a variety of adaptations and forms.