Again, in Las Hoyas! It is only 4.5 cms long, was a juvenile but not a baby, and lived in fresh water!
It has been nicknamed "Pablito" and is half the size of a newly born Etmopterus, the smallest modern day shark. The fossil is also extraordinary because it's complete- shark fossils usually consist on teeth, perhaps vertebrae only, but this one was fossilized whole, with muscle and even skin preserved.
It has been identified as a Lonchidion, a kind of hybdodontid that was common during the Cretaceous.