Ichthyotitan

Likely the largest marine reptile yet described, and possibly the closest any reptile came to blue whale length. Ichthyotitan is known from just two giant jawbones found on the Somerset coast in England, one at Lilstock in 2016 and one at Blue Anchor in 2020 by a father and his 11-year-old daughter. Scaling those bones against better-known ichthyosaurs gives a length between 20 and 26 meters for an animal that lived about 202 million years ago, shortly before a mass extinction. The researchers who named it in 2024 say plainly that two jawbones cannot settle its true size, so treat the upper figure as a possibility, not a measurement.