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Diplomystus and Knightia
Diplomystus and Knightia
Diplomystus and Knightia
Diplomystus and Knightia
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Diplomystus and Knightia

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Diplomystus dentatus and Knightia eocaena, unrestored specimen
Eocene (52.3 Million Years Ago) 
Green River Formation, Wyoming, USA 
In Stone Fossils Private Quarry 
  
Plate: 7.25" x 6.75"
Fish size:
     Diplomystus - 5.5" 
      Knightia- 3.5"

Ray-finned Fish - Diplomystus dentatus

Order Ellimmichthyiformes, Family Paraclupeidae
The last known species of the Ellimmichthyiformes order went extinct sometime in the middle Eocene. D. dentatus is a primitive relative of the modern day herring. The genus Diplomystus is also known from fossil deposits in China.
D. dentatus is the 2nd most common fossil fish found from Fossil Lake. Specimens ranging from embryonic size (about 0.7 inches) to full-grown adults (about 26 inches) are common. Smaller-sized specimens are more commonly found in mid-lake than near-shore deposits. This suggests that D. dentatus spawned in open water.
This species' upturned mouth indicates it fed at the surface of Fossil Lake. D. dentatus specimens are commonly found with other fish stuck in their mouths, including other D. dentatus specimens.