Alpha Metroid

The Alpha Metroid is the second stage of a typical Metroid's life cycle. When an infant Metroid reaches the Alpha stage, the closed membrane once at the top becomes the belly, and a plated exoskeleton grows on the top. The Alpha Metroid has two compound eyes and horns on its head at the front of the body.

Samus Aran encountered Alpha Metroids during her mission to SR388.