Pneumatoarthrus is an extinct genus of sea turtle known from the Late Cretaceous (early Maastrichtian) Mount Laurel Formation of Monmouth County, New Jersey.
The fossil record indicates that Pneumatoarthrus was a sea turtle that lived during the Late Cretaceous, specifically in the early Maastrichtian stage, and its remains were unearthed from the Mount Laurel Formation located in Monmouth County, New Jersey.