Octoomba

Octoombas (called Electrogoombas in Prima's Official Guide and the Super Mario Galaxy Trading Cards and also known as Octogoombas) are enemies that appear in Super Mario Galaxy and Super Mario Galaxy 2. They are very common aliens in most galaxies, and bear resemblances to Goombas and Octopus, both of which contribute to the name.

Super Mario Galaxy
Octoombas first appear in Super Mario Galaxy, in the first mission of the game. They reappear as common enemies in many galaxies after that. If Mario comes near one, it will headbutt him with its antennae. They can be defeated by spinning them or by jumping on them. Once defeated, they leave behind three Star Bits (if they were spun) or a coin (if they were jumped on). There are also two sub-species of them called Octoguys and Octopi.

Super Mario Galaxy 2
Octoombas re-appear in the sequel to Super Mario Galaxy, Super Mario Galaxy 2. Unlike in the first game, they won't headbutt Mario, but rather, they will spit rocks at Mario. Their name is revealed to be Octoombas by a Luma who guides Mario through a large planet. Two new sub-species are also introduced: Elite Octoombas and Octoboos.

Super Mario 3D World
Octoombas are re-appear in Super Mario 3D World as enemies in bonus world stages, first appearing in a space stage (World Star-2) unlocking Rosalina as the main enemies. Their attack pattern has changed once again - they now spit 3 metal balls in a straight line instead of a rock.

Appearance
Octoombas are alien-like Goombas. Their body style is exactly like that of a Goomba except for the antenna on top of their head. They have smooth, blue skin with yellow spots, a puckered round mouth and glowing yellow eyes. They attack with a headbutt or by spitting rocks, and only patrol a very small set area.

Sub-Species

 * Elite Octoomba
 * Octoboo
 * Octoguy
 * Octopus

Super Mario Galaxy Trading Card Description
''This class of Goomba, the long time Mario enemy, is adapted for space. These alien Goombas are found in many areas of the game and attack Mario by trying to headbutt him when he comes near. They can easily be destroyed by jumping on their heads. Electrogoombas are amphibious and have brown, red, and blue subspecies.''

Trivia

 * Octoombas resemble both Octoroks and Deku Scrubs from many The Legend of Zelda games.
 * Octoombas have a similar appearance to the Bloopers found in Super Mario Sunshine.
 * Octoombas also bear a resemblance to Shroobs from Mario & Luigi: Partners in Time.