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The Rugosa , also called the Tetracorallia , are an extinct order of solitary and colonial corals that were abundant in Middle Ordovician to Late Permian seas .. Ordovician. Ordovician. Permian. Permian. order. order ( biology ). colonial. Colony ( biology ). Solitary rugosans -LRB- e.g. , Caninia , Lophophyllidium , Neozaphrentis , Streptelasma -RRB- are often referred to as horn corals ' because of a unique horn-shaped chamber with a wrinkled , or rugose , wall .. Caninia. Caninia ( genus ). Lophophyllidium. Lophophyllidium. Neozaphrentis. Neozaphrentis. Streptelasma. Streptelasma. rugose. wiktionary :rugose. Some solitary rugosans reached nearly a meter in length .. However , some species of rugose corals could form large colonies -LRB- e.g. , Lithostrotion -RRB- .. rugose. wiktionary :rugose. Lithostrotion. Lithostrotion. When radiating septa were present , they were usually in multiples of four , hence Tetracoralla in contrast to modern Hexacoralla '' , colonial polyps generally with sixfold symmetry .. colonial. Colony ( biology ). Hexacoralla. Hexacoralla. Rugose corals have a skeleton made of calcite that is often fossilized .. calcite. calcite. Like modern corals -LRB- Scleractinia -RRB- , rugose corals were invariably benthic , living on the sea floor or in a reef-framework .. rugose. wiktionary :rugose. Scleractinia. Scleractinia. benthic. benthic. Some symbiotic rugose corals were endobionts of Stromatoporoidea , especially in the Silurian period .. rugose. wiktionary :rugose. Stromatoporoidea. Stromatoporoidea. Silurian. Silurian. Although there is no direct proof , it is inferred that these Palaeozoic corals possessed stinging cells to capture prey .. Palaeozoic. Palaeozoic. They also had tentacles to help them catch prey .. Technically they were carnivores , but prey-size was so small they are often referred to as microcarnivores .