Thank you very much.
I see you have much control over Tithonian and Lower Cretaceous ammonites.
The first does not appear in the thesis of Federico Oloriz (Kimmeridgian-Lower Tithonian), but I just saw an article in a Simocosmoceras very similar to my specimen. On the same level I found many Burckhardticeras peroni, Simoceras (Lytogyroceras) subbeticum, Phylloceras saxonicum, Haploceras indet. and other simoceratidae and perisphinctidae. With the second I was wrong then, I was convinced it was a Neocomitidae. The third had also thought Protacanthodiscus but clueless me shallow navel. Nearby I found a Protacanthodiscus I have classified as P. darwini of Durangites zone. The fourth is not mine but I'll try to get a ventral view. In the area where I was found I think is the Upper Jurassic, but I will try to get more information. And the last I'll change the classification to Acrioceras cf. meriani.
That said, thank you very much.
I put a photo of another Protacanthodiscus, I have classified as P. darwini but without much security.