Sandworm
From Sonic Retro
The Sandworm (Nal in the Japanese Manual) is a caterpillar badnik found in the quicksands of Sandopolis Zone. They swim around in the quicksand and jump out of it to attack the player. They are very similar to the Caterkiller, differences being the palette and the behaviour. But just like the Caterkillers, they can only be destroyed by jumping on their noggins.