PseudoamplexusPseudoamplexus is an extinct genus of horn corals belonging to the order Rugosa.Fossil recordFossils of Pseudoamplexus are found in marine strata from the Devonian to the Silurian. Fossils are known from the Czech Republic, Italy, Russia, Tajikistan, United States and China.DescriptionPseudoamplexus has a unique horn-shaped chamber with a wrinkled wall. These corals have a bilateral symmetry, with a skeleton made of calcite and divided by horizontal plates. They lived on the sea floor, in reef and in shallow subtidal waters.