What characterized the ancient Texas swamps inhabited by Xenacanthus?

Answer

Sluggish and low-oxygen waters.

The environment where Xenacanthus thrived during the late Paleozoic era was specifically described as characterized by its freshwater setting, often being shallow, sluggish, and periodically suffering from low oxygen levels. This specific poor water quality necessitated a predatory style that did not rely on high energy output or the pursuit of fast-moving prey. The environment selected for organisms adapted to survive periods of environmental stress, making slow, methodical foraging a necessity rather than a choice.

What characterized the ancient Texas swamps inhabited by Xenacanthus?
dietfossilsharkXenacanthus