Prolyelliceras Ulrichi or Peruvianum?

[Alvrr.0]

I dont know if this Ammonite is Prolyelliceras Ulrichi or Peruvianum 

Edited October 8, 2023 by Alvrr.0

[Tidgy's Dad]

Don't know, I'm afraid, but that's a very nice and interesting-looking ammonite. 

And species names are never capitalized, so that should be Prolyelliceras ulrichi or P. peruvianum.