Parapuzosia seppenradensis is the largest known species of ammonite. Image via Wikimedia Commons Though it would largely have depended on their size, ammonites would likely have eaten similar things ...

Ammonite fossils have been found across the ... There’s also a fossil fish mosaic triptych from the Green River Formation Lagerstätte, Wyoming – with specimens dating back 50 million years ...

They were also preyed on by larger reptiles and fish. As ammonites evolved throughout ... marine plankton. Ammonite shells are used today as index fossils, meaning they can help date other fossils ...

Fossils found in the northern part of Hokkaido are a new type of ammonite, the once-ubiquitous spiral-shelled creatures that went extinct with the dinosaurs 65 million years ago, researchers said.