Ichythyosaurs were dolphin-shaped swimming reptiles that gave birth to live young. They lived in the oceans at the same time dinosaurs were tromping around on land. Previously, researchers thought only one group of ichthyosaurs, called ophthalmosaurids, made it out of the Jurassic into the Cretaceous. The newly named fossil, dubbed Malawania anachronus, is a Cretaceous survivor that does not belong to the ophthalmosaurids, however. That means a "ghost lineage" of ichthyosaurs survived alongside the ophthalmosaurids, changing very little over millions of years.

The fossil in question was first found in the 1950s by British petroleum geologists, who noticed the slab being used as a stepping stone on a mule track in Iraq. The geologists rescued the fossil and took it to the United Kingdom, where it stayed unstudied until the 1970s. Because researchers didn't know where in the rock record the fossil had come from, they struggled to determine its age. (Layers of earth build up over time, meaning, in a general sense, the oldest layers will be on the bottom and the more recent layers more toward the surface.)