Name: Knightia
Phonetic: Nye-tee-ah.
Named By: Jordan‭ ‬-‭ ‬1907.
Classification: Chordata,‭ ‬Actinopterygii,‭ ‬Clupeiformes,‭ ‬Clupeidae,‭ ‬Pellonulinae.
Species: K.‭ ‬alta,‭ ‬K.‭ ‬branneri,‭ ‬K.‭ ‬eocaena,‭ ‬K.‭ ‬humulus.
Diet: Zooplankton,‭ ‬small invertebrates and possibly very small fish and fry.
Size: Depending upon species up to‭ ‬25‭ ‬centimetres long,‭ ‬the largest specimens slightly bigger.
Known locations: USA,‭ ‬Wyoming‭ ‬-‭ ‬Green River Formation.
Time period: Eocene.
Fossil representation: So numerous no one knows exactly how many specimens have been recovered.

       Knightia were small freshwater fish often described as‭ ‘‬herring-like‭’ ‬that lived in North America during the Eocene period.‭ ‬Also because Knightia were schooling fish they are often preserved still in their shoals with some specimens even being preserved on top of each other.‭ ‬This is why so many fossils of this fish are known,‭ ‬and why Knightia specimens are one of the most commonly traded fossils on the market.
       The majority of Knightia specimens are quite small,‭ ‬but some large specimens around twenty-five centimetres long are known.‭ ‬Knightia are often so well preserved that the scutes than run from the head to the median‭ (‬middle‭) ‬fins across the back and belly are often visible. Although Knightia may seem a small and unimportant fish,‭ ‬their sheer numbers strongly suggest that they would have formed an important part of their ecosystems biomass,‭ ‬being an abundant food supply for predators.
       Other fish from the Green River Formation include Heliobatis and Diplomystus.

Further reading
- The fossil fishes of California, with supplementary notes on other species of extinct fishes. - University of California Publications, Bulletin of the Department of Geology 5(7):95-144. - D. S. Jordan - 1907.
- The paleontology of the Green River Formation, with a review of the fish fauna. - Wyoming Geol. Surv., Bull. 63, pp. 85. - L. Grande - 1980.
- A Revision of the Fossil Genus Knightia, With a Description of a New Genus From the Green River Formation (Teleostei, Clupeidae). - American Museum Novitates. - Lance Grande - 1982.