Coral

Corals are most familiar to us today as colonial, reef-building animals. In the Permian, solitary Rugose (or horn corals) and colonial Tabulata corals were common.  Both of these types of coral are now extinct, having disappeared at the end of the Permian period.  
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Permian coral fossils. Left: sketch, rugose coral from the Ulladulla Mudstone, NSW, Right: possible tabulate coral, Margate, Tasmania