Diplomystus Fossil Fish, from Green River Formation, Wyoming, USA (No.5)

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Diplomystus Fossil Fish, from Green River Formation, Wyoming, USA (No.5)Diplomystus Fossil Fish, from Green River Formation, Wyoming, USA
50 Million Years, Eocene Period


Measurements Approx. Whole Size
Height - 5.7 cm
Width - 1.2 cm
Length - 9.3 cm



Diplomystus is an extinct genus of freshwater non-clupeoid clupeomorph fish distantly related to modern-day extant herrings, alewives, and sardines. The genus was first named and described by Edward Drinker Cope in 1877. There are seven species of Diplomystus: D. dentatus (Cope, 1877), D. birdii, D. dubetreiti, D. shengliensis (Chang 1983), D. kokuraensis (Uyeno 1979), D. primotinus (Uyeno 1979), and D. altiformis.

D. dentatus (Cope, 1877) is well known from lower Eocene deposits from the Green River Formation in Wyoming. It had a moderately deep body, a homocercal tail, single dorsal and anal fins, and a pelvic fin sited directly beneath the dorsal fin. The scales are thin and ovoid. The strongly upturned mouth is typical of a surface-water feeder.


Measurements Approx. Fish Size
Width - 1.4 cm
Length
 - 5.4 cm














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