Rhacolepis

Rhacolepis is an extinct genus of ray-finned fish[1] from the Cretaceous Santana Formation of Brazil.

[2] Complete fossilised hearts from this species have been recovered.

[3] This Crossognathiformes-related article is a stub.

You can help Wikipedia by expanding it.

R. buccalis skull
Inside the stomach of a Notelops brama .
R. buccalis with several hundred small shrimp in stomach.
Fossil in Vienna