World's Largest Ammonite

The largest known ammonite fossil is a specimen of Parapuzosia seppenradensis, discovered in Seppenrade, Germany, in 1895.

Massive Parapuzosia seppenradensis fossil, 1.8m diameter, from Late Cretaceous Germany.

This prehistoric marine creature, a distant relative of modern squids and octopuses, lived during the Lower Campanian Epoch of the Late Cretaceous period, around 80 million years ago.

This ammonite's shell is coiled in a spiral, typical of the group, but its sheer size dwarfs most other known specimens. The fossil is incomplete, missing parts of its living chamber, which is why estimates of its full size vary. Some studies suggest it could have reached 2.55 meters (8.4 feet), while others propose a maximum of 3.5 meters (11 feet).