Diplomystus
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DIplomystus (Cope, 1877) is an extinct genus of non-clupeoid clupeomorph fish distantly related to modern day extant herrings, alewifes, and sardines. There are four species of Diplomystus: Diplomystus dentatus (Cope, 1877), Diplomystus birdii, Diplomystus dubetreiti, and Diplomystus shengliensis (Chang 1983).
Diplomystus dentatus (Cope, 1877) is well known from lower Eocene deposits of the Green River Formation in Wyoming. Specimens range from larval size to 65 cm and are commonly found in close association with the extinct herring Knightia sp.
