Mazohydra megabertha Hydra Pennsylvanian Francis Creek Shale Braidwood, Illinois There are no features of this specimen that would indicate that it definitely is a hydra belonging to this species. Dr. Richardson once thought that this specimen could also be a poorly preserved specimen of the squid Jeletzkya, but there are no feature to indicate that it could be that either. Size: The concretion is 4 cm tall.