Esconichthys apopyris
Pennsylvanian
Carbondale Formation
Kankakee Co.
Illinois, USA.

Fossil fish from Esconichthys apopyris, an extinct ray finned bony fish from the Carbondale Formation of Kankakee County, Illinois. This specimen comes from the Pennsylvanian Subperiod, approximately 307 million years ago, when the region consisted of swampy lowlands, river channels, and shallow brackish waters.
Large 55mm fish in 75mm paired concretion