Named By: Samuel Wendell Williston - 1903.
Classification: Chordata, Reptilia, Sauropterygia, Plesiosauria?
Species: A. mirus (type).
Known locations: USA, Kansas - Kiowa Shale.
Time period: Albian of the Cretaceous.
Fossil representation: Single bone.
When it comes to naming prehistoric animals, the names can be confusing, but Apatomerus, which means 'deceptive femur’ was spot on. Initially thought to a thigh of a crocodile, Williston later declared it to be a pterosaur bone. Later study has now deduced that it is probably not a pterosaur bone and is possibly from a plesiosaur.