Nephrite

The Centipeetle Mother was host of the centipeetle group that raided Steven's bedroom in "Gem Glow." It also appears in "Monster Buddies", where Steven tames the Centipeetle Mother in its smaller form (which it acquired after Steven popped it's bubble) and sacrifices itself to save Steven. Steven says "I will heal you someday," but it is unknown whether the Centipeetle Mother will return again. It was confirmed that the Centipeetle is a gem in Ocean Gem.

Appearance
The Centipeetle Mother takes the form of a giant centipede-like creature. It is composed of roughly thirteen (visible) dark-green segments (excluding the head and the rear) that each bear one pair of similarly colored legs. The final segment bears no legs, but what appears to be a pair of mandibles. Each of these segments is covered on the top side with a hard crystal covering. Its head is composed primarily of a gigantic pair of jaws/mandibles with a gem in the back of the "mouth". This gem is circular in shape and colored light green with dark-green contour lines surrounding the circumference of the gem, connecting to a circular shape. Its gem seems to act as its iris, being in the middle of what would rationally be a sclera. It also features a green crystal protuberance on the base of the head that forms a broken horn-like structure. It has a flowing, light-cream colored mane immediately behind its head.

After being released from the bubble in "Monster Buddies" and regenerating, it appears in an all-around reduced form. Its body is reduced to only two segments, and its mane, head, and secondary mandibles have been reduced in size as well probably indicating that it has to grow over time. This can be seen as the Centipeetle Mother grows throughout the episode. Its gem now comprises the entirety of its whole eyeball instead of just the iris, and the gem on its head is now gone.

Regenerations
The Centipeetle's debut regeneration. It was much larger than its most recent form. It was composed of roughly thirteen visible dark-green segments, excluding the head and the rear, each one bearing a crystal-like shell on top and pair of similarly colored legs. The final segment had no legs but a pair of mandibles. It also had a green crystal protuberance on the base of its head.

Abilities
The Centipeetle Mother is capable of eating with its mouth despite its eye being located in its jaw and blocking its throat, thus making it so that there is no visible means of having the ingested food reach any sort of stomach.

Unique Abilities

 * Hybrid Arthropod Physiology: Due to having the appearance of two arthropods, specifically a centipede and a beetle, the Centipeetle Mother has the innate abilities of both organisms.
 * Chilopodan Physiology: Like a centipede, the Mother uses its jaws to attack enemies or prey. Both employ deadly substances in their attacks. The centipede uses venom while the Mother uses a corrosive liquid.
 * Coleopteran Physiology: Like a beetle, the Mother's defenses are increased due to the hard gem-like covering on each segment possesses.
 * Climbing Skills: It is able to climb vertical walls and sheer cliff faces.
 * Creature Creation: The Centipeetle Mother has the ability to produce and command Centipeetles that aid it in battle.
 * Corrosive Liquid Generation: It can produce an extremely corrosive substance that can easily erode various materials, ranging from wood to stone to ice. It can use this corrosive substance as a projectile to attack from afar or assault enemies with a constant torrent of the substance to easily break down their defenses.
 * Rotative Spitting: In "Monster Buddies", the small Centipeetle Mother is seen to be able to rotate its head many times. It utilized this in that it spun its head rapidly and sprayed its corrosive substance, showering the immediate area in a manner extremely similar to that of a sprinkler.

Trivia

 * The Centipeetle Mother returns in the episode "Monster Buddies"
 * When the Centipeetle Mother was reforming itself after it escaped from the bubble, it took a humanoid form before taking its latest form.
 * This could be the case with all Gems.
 * It can still eat with its mouth, even though its eye is also in its mouth.
 * The gem in its mouth somewhat resembles an Emerald colored Poké-Ball from the Pokemon series.
 * Steven befriended the Centipeedle, to the extent that it sacrificed itself in order to save Steven.
 * It has a phobia of Garnet's gauntlets because Garnet threatened it with them in the temple.
 * It was revealed in the episode Ocean Gem that the Centipeedle, along with other monsters, was previously a gem. Unfortunately, the gem became corrupted, turning it into the monster it is now.
 * It is reasonable to assume the humanoid form it took on before transforming again is it's form before corruption.
 * Many fans speculated the Centipeetle Mother used to be a Gem called Malachite, but Ian Jones-Quartey confirmed that the corrupted Gem that it used to be is not Malachite.