Darkling Tentacle

From Wikitroid, the Metroid wiki

The Darkling Tentacle is an Ing that is essentially a long tentacle. It sticks out of the wall and swings back and forth damaging you if they hit you. They can be stunned with a shot from your light beam or can be rolled under in the morph ball. "There is no way to kill them". There is a way to actually kill them, this might be a log book error or a glitch, but a charged light beam or anihhilator beam (harder to kill) can destroy these creatures, but the success chance is about 20% with light beam and 5% with anihhilator.