Pterospathodus
Pterospathodus is an extinct genus of conodont from the Silurian period.
Use in stratigraphy
The Telychian of Estonia can be defined by five conodont zones.The Sheinwoodian is defined between the acritarch biozone 5 and the last appearance of Pterospathodus amorphognathoides. The List of [Global Boundary Stratotype Sections and Points|global boundary stratotype point] is in Hughley Brook in Apedale, U.K.