Your ammonite probably is...
Tropites
Suture: Ammonitic
Tropites was a Triassic ceratite with unusually advanced sutures. It had a broad shell with simple, curved radial ribs. It had a deep, open umbilicus. There was a small arched keel on its venter.
Image by Ghedoghedo, CC BY-SA 4.0, https://commons.wikimedia.org/wiki/File:Tropites_telleri.jpg
