title: Lochriea
text: # Lochriea
  
  Lochriea is an extinct genus of conodonts.
  
  ## Use in stratigraphy
  
  The Visean, the second age of the Mississippian, contains four conodont biozones, two of which are named after Lochriea species:
  
  * the zone of Lochriea nodosa
  * the zone of Gnathodus bilineatus
  * the zone of Lochriea commutata
  * the zone of Pseudognathodus homopunctatus
  
  The Serpukhovian, the third or youngest age of the Mississippian, includes three conodont biozones, one of which is named after Lochriea species:
  
  * the zone of Gnathodus postbilineatus
  * the zone of Gnathodus bollandensis
  * the zone of Lochriea ziegleri
  