Thrissops

Thrissops is an extinct genus of stem-teleost fish from the Jurassic and Cretaceous periods. Its fossils are known from the Solnhofen Limestone, as well as the Kimmeridge Clay.
"Thrissops" was a fast predatory fish about long, that fed on other bony fish. It had a streamlined body with a deeply cleft tail and only very small pelvic fins. "Thrissops" was one of the smaller members of the order Ichthyodectiformes, which also included giants like "Xiphactinus" and "Saurodon".