Wikipedia
Occithrissops is an extinct genus of prehistoric ray-finned fish of the Jurassic, known for its fearsome yet small appearance. The genus name of Occithrissops derives from the Latin word "Occi" (killing) and the Greek words "thriss" (fish) and "ṓps" (“face”). Similar in relationship to the Thrissops, it was a slightly larger predatory teleost fish with serrated pelvic fins, a cleft tail, and a bony tongue similar to the Arapaima and formerly mentioned Thrissops, bearing small teeth for catching small slippery prey like squid, invertebrates and fish. The bony tongue assisted the fish in consuming hard shelled invertebrates which included small nektonic Jurassic ammonites, which despite the growing decline of ammonoids were still prevalent and plentiful for their time.