Prehistoric armored fish swimming through a Devonian coral reef

A highly detailed, ultra-realistic underwater photograph of a prehistoric Devonian shallow sea. Crystal-clear blue water is illuminated by strong shafts of sunlight (god rays) streaming down from the surface. In the left mid-ground, a large armored placoderm fish with heavy bony plates, a powerful jaw, and a streamlined body swims gracefully toward the right. Several smaller similar armored fish and schools of other ancient fish move among the reefs. The seabed is covered with dense, layered ancient coral formations, including broad flat tabulate corals, branching rugose corals, and rounded stromatoporoid-like structures in shades of brown, green, and beige. Soft aquatic plants and smaller reef organisms fill the spaces between the corals. The water has excellent visibility, with fine particles catching the light. Cinematic wide-angle composition, hyper-realistic textures of fish armor, coral surfaces, and water caustics, natural underwater lighting, photorealistic, 8k resolution, no text, no watermark, no UI elements.