Hysalrian

Hysalrians were a species of four armed serpent-like sentients. The only known example of a Hysalrian was Jedi Master N'Kata Del Gormo who trained a young Yoda in the ways of the Force on his homeworld.

Behind the scenes
Hysalrians were created by Chuck Hamilton, a Star Wars fan, as part of the Design An Alien contest held in the Star Wars Galaxy Magazines. Though this entry was not picked as a winner, it was given an honorable mention in Star Wars Galaxy 9.