Eocene Period- C. 50 Million Years Ago

Order to which the fossil belongs: Ellimmichthyiformes
Name of which the family belongs: Ellimmichthyidae

The Diplomystus fish comes from one of the world’s famous Laggerstatten, the Green River Formation in Wyoming, USA. Its body form and upturned mouth, is common of a surface feeding fish, as is thought to have been a predator of smaller surface-feeders such as Knightia. Some specimens of Diplomystus have been found with knightia in their mouths or stomachs.

Of a large size with good definition of the Diplymystus fish on a matrix.

Matrix: 112mm x 178mm length
Diplomystus: 141mm length