Shellcrawler

Shellcrawler (シェルクローラー) is a tank-like enemy from the Mega Man Zero series that attacks with charged shots when the front part of the shell comes up. If the shell is destroyed, it will start to move faster and attack with three shots at a time. It appears in the Duel in Desert mission in Mega Man Zero and in the Snowy Plains in Mega Man Zero 3.