Belonostomus (meaning "big long mouth") or Diphyodus (meaning "double tooth") is a genus of prehistoric ray-finned fish that was described by Louis Agassiz in 1844. Fossils range from 99.6 million years ago (species unknown) to 66 million years ago (B. longirostris). Belonostomus species include: \n* Belonostomus acutus \n* Belonostomus carinatus \n* Belonostomus crassirostris \n* Belonostomus indicus \n* Belonostomus longirostris \n* Belonostomus münsteri \n* Belonostomus tenuirostris