Triple Diplomystus dentatus | Green River Formation | Wyoming

Diplomystus dentatus Eocene (51.98 Million Years Ago) Private Quarry, Green River Formation, Wyoming, USA Preparation by Jim Tynsky Obtained from the collection of Dr. William Rieger   Plate approx. size: 21.25" x 10.5" x 1.5" Diplomystus approx. sizes: 5.5" - 6.5" This piece has had some repair work done, but no restoration.   Diplomystus is an extinct genus of freshwater 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.   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 a