Puromi

Puromi are an enemy encountered in Super Metroid, in the lower levels of Norfair surrounding Ridley- they are confined to a single room containing many breakable pillars and continually rising lava. Each individual consists of a line of eight large, glowing orange spheres which "leap" out of the lava in a low arc, passing unhindered through walls and obsticles and damaging Samus should she come into contact with them. They are impervious to all weapons, although the Screw Attack allows Samus to pass through them without taking damage. They are only named in the game's debug code.

Trivia

 * Puromi bear a strong resemblence to the Polyps of the original Metroid in appearance, habitat, and behavior. It is possible that the two species are in some way related.
 * The entities are also quite similar in appearance and movement to a Luminoth mechanoid known as the Octopede. It is possible that Octopede are based off of Puromi in the same way that the Luminoth modeled their Mechlops robots off of the Triclops species.
 * However, the Puromi themselves seem visually somewhat mechanical in nature. They may in fact be mechanoids as well.