alpha_metroid
The first stage of evolution of a metroid (creature). It grows a carapace for 50% of it's body, as well as eyes and horns. The nucleus has become a "belly" for the creature.
See also
•• Metroid larva•• Alpha metroid (you are here)
•• Gamma metroid
•• Zeta metroid
•• Omega metroid
•• Queen metroid •• Metroid: Samus Returns