Ceratoichthys is an extinct genus of lookdown-like prehistoric jackfish that lived during the late Ypresian epoch, of the Early Eocene.

It contains a single species, C. pinnatiformis of Monte Bolca, Italy.

[1][2] It and Vomeropsis are the only known members of the extinct subfamily Vomeropsinae.

Its fins give it a superficial resemblance to a freshwater angelfish, leading some people[who?]

It is the official symbol of the Società Paleontologica Italiana (Italian Paleontological Society).