Tirasiana is a genus of disc-shaped animals from the Ediacaran period that contains three species: T. concentralis, T. coniformis and T. disciformis, all which are distinguished by the complexity of their stepped structure. Affinity
Tirasiana moulds are thought to be discoidal body fossils of some kind, showing radial symmetry in them and with a round nodule in the middle.
See also
List of ediacaran genera
Aspidella
References