Bredyia diadematoides (Mayer, 1871)

12cm. It's not quite complete and I had to patch it up somewhat, but I'm glad to have found it since it's somewhat of a rarity here. It used to belong to the Genus Hammatoceras a few years ago, but ask the experts about that - they're still argueing about it.

Found in the Geisingen-Oolith, Concavum Zone, Upper Aalenian, Middle Jurassic of the clay pit in Geisingen.