Your ammonite probably is...
Pavlovia
Suture: Ammonitic
Pavlovia had radial ribs that branched before crossing the venter. Its shell was evolute and had circular whorl cross-sections. It had complex sutures. The living chamber took up almost a full whorl. Pavlovia comes from the Upper Jurassic of Europe and Greenland.
Image by Hectonichus, CC BY-SA 3.0 Unported and GFDL, https://commons.wikimedia.org/wiki/File:Dorsoplanitidae_-_Pavlovia_species.JPG"https://commons.wikimedia.org/wiki/File:Dorsoplanitidae_-_Pavlovia_species.JPG">https://commons.wikimedia.org/wiki/File:Dorsoplanitidae_-_Pavlovia_species.JPG