Utuboros

Utuboros is the giant sea-serpent mini-boss in Launch Octopus' stage. It likes to come in and out of the sand. Destroy either the head or the tail end to destroy the robot. This enemy also makes a cameo in the intro cartoon of the Playstation remake of Mega Man X3.

This particular enemy also appears in Mega Man X7, one in the Lava Factory (Flame Hyenard's stage), and a three-headed one appears in the Battleship (Splash Warfly's stage).

Trivia

 * The name Utuboros comes from the word Uroboros which is the name of a serpent devouring its own tail.