Turtle

A turtle is a type of reptile with a hard outer shell as it's primary feature. The Chelon race resembled large saber-toothed turtles.

In Japanese mythology, the turtle represents longevity and good luck. (TNG short story: "Bedside Matters")

Cervantes Quinn noted that the Dulcinea handled like a turtle slogging through the mud while traveling through the wormhole to the Jinoteur system. 

Starfleet officers jokingly called the K'el Ri'anda class starship the turtle due to the ship's relatively poor performance and bloated appearance. 

On Ceti Alpha V before the planet had been laid waste, Marla McGivers and Zuleika Walker encountered a giant turtle. 

On the planet Droplet, Melora Pazlar had wondered if a series of floating islands were some kind of giant turtles.