Grubby

A Grubby is a spiked form of Unera appearing in the Tree Zone of Super Mario Land 2: 6 Golden Coins. They are best described as bee larva with oddish spikes covering their bodies. They can be defeated by hitting a block they're on top of or by using a Star.

Super Mario Land 2: 6 Golden Coins

 * Virtual Console Manual: "This is a slug with a stinger. Don't tread on this grub, as its sting is really powerful."