Sinoeugnathus kuichouenses is a very rare armored bony fish found in the same fossil beds as the Keichousaurus hui. They are from the Middle Triassic period of Southwest China (Tingzial Formation, Huixia Beds, Guizhou Province, Guangling, China.
It is a member of the order Paleonisciformes, and the family Paleoniscidae. It is covered with ganoid scales (small diamond shaped plates), which are characteristic of the order and they are related ot modern sturgeons. There are four principal types of fish scales. They are cycloid scales (salmon and carp), Ctenoid scales (perch), placoid scales (sharks and rays), and ganoid scales (sturgeons and gars).
Kingdom: Animalia, Phylum: Chordata, Class: Actinopterygii, Order: Paleonisciformes, Family: Paleoniscidae, Genus: Sinoeugnathus, Species: kuichouensis.
The Subclass: Mysidacea is from the Malacastraca class of arthropod shrimp. The Mysidaceans are further divided into three orders: the Mysida, the Lophogastrida, and the Pygocephalamorpha. The first two orders are quite rare and are limited to only a few examples in the fossil record. The third is still rare, but is represented by more specimens and is also larger than the first two. The specimens are well preserved due to their preference for deep water habitats which allowed for excellent preservation with fewer scavengers. It is difficult to come up with a genus and species name for this specimen due to the fact that this area is still being studied and there is still some dispute as to where different specimens are likely to end up. So far the only detail I have been able to extract is the order Pygocephalamorpha. This specimen did not fit into either of the first two orders since the specimens for those two orders were quite a bit smaller.
This specimen is being offered from a private collection!
Sinoeugnathus kuichouensis & Mysidacean shrimp 
Quantity in Basket: None
Code: OCF-403
Price: $6,000.00
Shipping Weight: 10.33 pounds
Time: Early - Middle Triassic, approximately 242-225 million years ago.
Location: Tingziao Formation, Huixia Beds, Guizhou Province, Guangling, China.
Dimensions: 12-3/4" x 8" x 1/2"