Mecha-Arm

Mecha-Arm is, as its name implies, a mechanical arm, and is found in Mega Man X2. It first appears in the intro stage, and they tend to grab X and drop him either back a bit, or into a damaging area, much to the annoyance of players. X needs to keep moving to avoid getting grabbed. It also shows up in the level where Mega Man X defeats Violen.