ThalassoAtrox

https://www.nature.com/articles/s41598-024-58377-0 Another super-sized reptile. This time it's a giant madtsoiid snake that reached comparable lengths to the famous Titanoboa, though it probably would not have been as robust, as its vertebrae are smaller. Vasuki indicus has been described based on a vertebral column from the early Lutetian Naredi Formation of India (47 mya), and it's been estimated to have stretched 11-15 meters. The highest estimate probably isn't correct, needless to say, but even at a more conservative length of 11-12 meters, that's a hell of a snake and life for early whales like Ambulocetus would have been a lot scarier than just crocodiles and otodontid sharks.