Diplomystus are commonly found in the Green River Formation near Kemmerer, WY. They can reach up to 26" in length. The Diplomystus' diet consisted of algae or zooplankton, but larger specimens are also known to have eaten Knightia, smaller Diplomystus, and Priscacara.
This particular Diplomystus measures:
Plate: 6.75" x 4.5"