Idiognathodus
Idiognathodus is an extinct conodont genus in the family Idiognathodontidae.The species Idiognathodus simulator made its first appearance during the Gzhelian, the youngest age of the Pennsylvanian.
Two species are amongst the three conodonts forming the biozones of the Kasimovian, the third stage in the Pennsylvanian.
One species is an index fossil of a biozone of the Bashkirian, the oldest age of the Pennsylvanian, amongst six biozones based on conodonts.
