Phaulactis is an extinct genus of rugose coral that existed during the Ordovician, Silurian and Devonian periods. It can be found in Europe, North America, Asia and Australia. Phaulactis was described by Ryder in 1926. Description All members of this genus are horn-shaped solitary corals, although the exact shape can vary between species. Phaulactis is most easily identified by its large amount of septa, deep calyx and distinct internal structure with three clear areas with different properties (but these sections are not always present in younger individuals). Another common trait is clear septal ridges. species Phaulactis angelini Wedekind, 1927 Phaulactis angusta Lonndsdale, 1839 Phaulactis clarkei Wedekind, 1927 Phaulactis cyathophylloides Ryder, 1926 Phaulactis gracile Wedekind, 1927 Phaulactis högklinti Wedekind 1927 Phaulactis iregularis Wedekind, 1927 Phaulactis tabulatum Wedekind, 1927 Phaulactis trochiformis McCoy, 1850 Phaulactis variabilis Kato et Ezaki, 1986 References Stauriida Rugosa Prehistoric Anthozoa genera