There was a vast range of fish living 100 million years ago in the inland sea. Many of these fish have not yet been scientifically studied. Below is information on three identified species.
The elongated body of Richmondichthys was covered in large thick scales to help protect it from predators. These scales were covered in ridges of bony material to add strength. Small scales along the top and bottom aided flexibility.
Dr Alan Bartholomai formerly with Queensland Museum offers the following description of a fish specimen discovered 12km north of Richmond in August 2008. (pictured above)
It is a pachyrhizodontoid teleost, Pachyrhizodus marathonensis. It is by far and away the most complete specimen I have seen anywhere, even without the fossilized gut contents. Age of the specimen is the same as other Toolebuc/Allaru Formation species viz.latest mid to late Albian (Lower Cretaceous) based on dinoflagellate zonation and spore-pollen analyses from elsewhere in the Basin.