Diplomystus

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Diplomystus
Fossil range: early Eocene
Diplomystus from Eocene of Wyoming
Diplomystus from Eocene of Wyoming
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Clupeiformes
Family: Ellimmichthyidae
Genus: Diplomystus
Species: See text

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), D. birdii, D. dubetreiti, and D. 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.