No.25 Red stingray

A saltwater fish belonging to the stingray family of the order Stingrays and found in shallow waters mainly in Asia. They have no scales and are covered with mucus to protect themselves from bacteria in the sea.
It is said that there are about 80 species of stingrays in the seas around Japan and about 600 species worldwide, many of which have a poisonous spine called a tail spine. Stingrays also have a tail spine near the middle of their tail, which is jagged like a saw when viewed up close and is difficult to dislodge when it sticks.

This specimen was CT scanned at the request of NHK Enterprises, Inc. as part of NHK E-television's “Gyogyotto Sakana★Star” project.
Gigyokkotto Sakana★Star" program HP: https://www.nhk.jp/p/ts/P58QMGP4K1/

CT imaging revealed that it is a cartilaginous fish, like sharks, because the contrast of its bones is darker than that of other fish and it has no ribs or other bones.
There is a ray that resembles a shark called the Sakatashark, and there is a shark that resembles a ray called the Cassshark, both of which are members of the ray family. Because of their similarities as cartilaginous fishes, rays are thought to have evolved from sharks that lived on the ocean floor.
It is also thought that cartilaginous fishes have been around for quite a long time and have increased in variety as they have evolved over the years to suit different locations.
Also, although the stingray shows a darker contrast of bones overall, the tail spines appear very bright, and it can be observed that they are the hardest structure on the body.