This fossil Tharrhias sp. fish fossil is THE LARGEST SPECIMEN OF THIS SPECIES WE HAVE EVER SEEN. The full, lifelike relief throughout of this amazing specimen must be seen in person to appreciate. Even the pearly luster is still present in the large inflated scales. We received this remarkable specimen from a 40+ year private German collection, in an un-prepared state and performed all the time-intensive lab work in our own facility. The fossil had very little of the original geode left so for stability, we placed the original fossil in a reconstituted geode for best reinforcement of the specimen. THE MAJORITY OF SPECIMENS OF THIS SPECIES ARE LESS THAN HALF THIS SIZE!
Tharrhias is an extinct member of the Gonorynchiformes, an order of ray-finned fish. Gonorynchiformes have small mouths and no teeth. They are the sole group in the clade Anotophysi, a subgroup of the superorder Ostariophysi. They are characterized by a primitive Weberian apparatus formed by the first three vertebrae and one or more cephalic ribs within the head. This apparatus is believed to be a hearing organ, and is found in a more advanced and complex form in the related cypriniform fish, such as carp. Also like the cypriniforms, the gonorynchiforms produce a substance from their skin when injured that dissolves into the water and acts an alarm signal to other fish.