Which massive marine reptile did Xiphactinus coexist with but not dominate as a predator?
Answer
Mosasaurus
*Xiphactinus* held the specific title of the dominant *fish* predator in its environment. However, it shared the Late Cretaceous seas with imposing marine reptiles, including the gigantic *Mosasaurus*. While *Mosasaurus* occupied a higher ecological niche overall due to its size and reptilian physiology, *Xiphactinus* maintained undisputed control over the predatory fish niche, demonstrating a distinct specialization that allowed it to thrive alongside these colossal reptiles.
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