Patrognathus
# Patrognathus

Patrognathus is an extinct genus of conodonts.

## Use in stratigraphy

The Tournaisian, the oldest age of the Mississippian (also known as Lower Carboniferous) contains eight conodont biozones, four of which contain Patrognathus species:

* the zone of Siphonodella quadruplicata and Patrognathus andersoni (upper zone of Patrognathus andersoni)
* the lower zone of Patrognathus andersoni
* the zone of Patrognathus variabilis
* the zone of Patrognathus crassus
