Brychaetus is an extinct genus of prehistoric bony tongue fish known from the Late Cretaceous to the Eocene. It contains a single species, Brychaetus muelleri. Its fossils have been found in Europe, North America, and northern Africa. This freshwater fish had very long teeth which are half bone and half enamel. It's thought to be related to the modern day arowana although the presence of a sclerotic ossicle in the fossil record would suggest that they were a deep water fish unlike modern day arowanas which are surface feeders. See also Prehistoric fish List of prehistoric bony fish References Monotypic ray-finned fish genera Prehistoric ray-finned fish genera Osteoglossidae Prehistoric fish of Africa Prehistoric fish of Europe