Hexagonaria has tabulate colonies with large numbers of small but massive corallites. The numerous thickened septa do not extend into the centre and are joined together by a wide dissepimentarium. In the calyx, above the tabularium, there is a deep, narrow depression. This Hexagonaria is from the Silurian.
Bivalve-Mollusc brachiopod Brain Coral Bryozoan Cephalopod Club Moss compound rugose coral Conulariid Coral Crinoid Crinoidea Crinoids Echinoderm Echinodermata Favosites feather duster coral Gastropod Glossopteris Glossopteris Branch Graptolite Graptolites Graptolithina Graptolithinia Hexagonaria Horn Coral Lamp Shell Leaf Lepidodendron Leptagonia Proteus Rugose Coral Solitary Rugose Coral Spiny Brachiopod Spiriferida Stigmaria ficoides Syringopora tabulate coral Themnopora Trilobite Vertebraria