Palaeophis typhaeus, an extinct giant marine snake, thrived during the Eocene epoch. It inhabited warm, shallow seas, showcasing elongated bodies adapted for aquatic life. Fossil evidence suggests it reached lengths of up to 9 meters, employing a serpentine swimming motion to navigate its oceanic environments.

Palaeophis typhaeus, a species of extinct marine snake, is primarily known from fossil records found in the Eocene-aged deposits of the southeastern United States, particularly in the Gulf Coastal Plain region. Notable locations include parts of Alabama and Mississippi, which were covered by a shallow sea during the Eocene epoch.

During the Eocene, the regions where Palaeophis typhaeus fossils have been discovered were characterized by warm, tropical to subtropical marine environments. The area was dominated by shallow, continental shelf seas with extensive coral reefs, lagoons, and estuaries.

Palaeophis typhaeus inhabited marine environments, likely occupying a niche similar to modern sea snakes. It was adapted to a fully aquatic lifestyle, feeding on fish and other marine organisms. Its morphology suggests it was an effective swimmer, with a long, streamlined body suited to navigating the open ocean and coastal waters.