Type
Zone
Age range
435.5–435.2 Ma
Llandovery
Telychian
Pterospathodus amorphognathoides amorphognathoides
Pterospathodus amorphognathoides lithuanicus
Pterospathodus amorphognathoides lennarti
435.50435.48435.46435.44435.42435.40435.38435.36435.34435.32435.30435.28435.26435.24435.22435.20