Scworm

Boomerang Blower (aka Schworm) is an enemy in Mega Man 2. It appears in Flash Man's stage, Air Man's stage, Quick Man's stage, and in the first section of Dr. Wily's castle. They tend to shoot up worm creatures that hop out. You would need a low hitting weapon to destroy the source. The worms themselves self-destruct eventually, or you can shoot them.