Marbled Freshwater Stingray

The marbled freshwater stingray (Himantura oxyrhyncha) is found in three or four rivers in Cambodia and Thailand. It is extremely rare, and known to science from only five museum specimens. Nothing is known about its habits in the wild. It is known, however, that this ray is in danger because of heavy fishing and pollution in its rivers, as well as because of the pet trade. A Thai conservation scheme was put on hold in the late 1990s.

Image from eol.org