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Which kinds of corals became extinct during the Permian extinction?

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Line graph showing the number of marine animal families from the Precambrian era to the present, with illustrations of key groups such as trilobites, ammonoids, marine reptiles, and diatoms. The graph highlights major extinction events and a rise to 1,900 living families today. — Permian extinction The diversity of marine animal families since late Precambrian time. The data for the curve comprise only those families that are reliably preserved in the fossil record; the 1,900 value for living families also includes those families rarely preserved as fossils. The several pronounced dips in the curve correspond to major mass-extinction events. The most catastrophic extinction took place at the end of the Permian Period.

During the Permian extinction, the two primary groups of corals that became extinct were the rugose corals and the tabulate corals.12

These corals, which were significant components of Paleozoic marine ecosystems, were among the many shallow warm-water invertebrates that suffered severe losses during this period of mass extinction. Their disappearance marked the end of these specific coral groups at the close of the Paleozoic Era.12