The largest known ammonite

Parapuzosia seppenradensis (Landois, 1895) is the largest known planar coiled (coiled like a rope) ammonite. It is from Germany and is of Late Cretaceous (early Campanian) age, and it is 1.8 m (5.9 feet) in diameter. Its shell is incomplete because the living chamber is missing. The largest specimen of this species was found in Germany. Many museums throughout the world have replicas of this desmoceratid ammonite species on display, including the Los Angeles County Museum of Natural History. Ammonites are extinct cephalopods that died out at the end of the Mesozoic Era (65 million years ago). Living cephalopods include the chambered Nautilus, squids, octopods, and a few other groups.