Extinct species of Tabulata

Tabulate corals occur in the limestones and calcareous shales of the Ordovician and Silurian periods, often forming low cushions or branching masses alongside Rugose corals.

Tabulate corals began to decline during the middle of the Silurian period, finally becoming extinct at the end of the Permian period.

1. Threatened species of Zoantharia
2. Extinct species

1. Order
2. Extinction
3. Disorder