» For the plant genus Knightia, see Knightia (plant) Knightia is an extinct genus of fish well-known from abundant fossils found in the Green River Formation of Wyoming, United States. They rarely exceeded 25 cm in length and are found throughout the formation. Knightia was a slender fish and seems to have been a secondary consumer, feeding mainly on ostracods, algal forms and diatoms, as well as some smaller fish. They were schooling fish, and because of this they're frequently found together… (More on Knightia)