Patrognathus
Patrognathus is an extinct genus of conodonts.
Use in stratigraphy
The Tournaisian, the oldest age of the Mississippian contains eight conodont biozones, four of which contain Patrognathus species:- the zone of Siphonodella quadruplicata and Patrognathus andersoni
- the lower zone of Patrognathus andersoni
- the zone of Patrognathus variabilis
- the zone of ''Patrognathus crassus''