Turtles are a class of mostly amphibious reptiles having a shell into which each can retract its legs, tail and head.
The Rigellians are a reptilian species that evolved from turtles. (Star Trek: The Motion Picture)
While growing up B'Elanna Torres was made fun of for being half Klingon. She was once called "Miss Turtle Head" by Daniel Byrd, an insult which referred to her cranial ridges. (VOY: "Juggernaut")
- During the production of Star Trek: The Next Generation, the nickname for Michael Dorn's Klingon prosthetic forehead was "the turtle".