A pan-chelydrid, Chelydropsis aubasi sp. nov., from the Middle Eocene (MP 15, early Bartonian) of Chéry-Chartreuve, France.

Snapping turtles (Pan-Chelydridae) play an important role in modern ecosystems throughout North America, but their fossil record is notably poor. We here describe a new species of fossil pan-chelydrid, Chelydropsis aubasi, from the Middle Eocene (MP15, Bartonian) of Chéry-Chartreuve, Department of Aisne, France, based on a series of fragments that document most of the shell. The new species not only bridges the morphological gap between earlier pan-chelydrids from North America and later pan-chelydrids from Europe but also advances the arrival of the group from North America to Europe by at least 10 million years. Although pan-chelydrids are notably absent from Early and Middle Eocene localities throughout Europe, the new fossil gives credence to the idea that pan-chelydrids may have dispersed from North America to Europe in concert with other turtles during the Paleocene-Eocene Thermal Maximum, but remain undetected to date.