Pillbug

From Wikitroid, the Metroid wiki

Pillbugs are small, insectoid creatures that crawl through spaces only accessible with the Morph Ball. When approached, they curl up into balls and roll slightly faster. They inflict little damage, and can be destroyed by being flipped over by a Bomb and then attacking the now vulnerable underside.

A boss variation called the Spider Guardian appeared in Metroid Prime 2: Echoes as a Sub Guardian. In Metroid Prime 3: Corruption another variation appeared called the Phazon Pillbug, appearing only in the Gel Processing Site on Bryyo.

[edit] Logbook Entries

• "Morphology: Pillbug. Cave-dwelling herbivore. Vulnerable to concussion blasts: use them to stun and damage this enemy."
• Pillbug "Pillbugs prefer to dwell in dark caverns, though they can exist in lit areas. Navigating with a series of sensitive antennae, they roam through caves in search of moss and fungus. Pillbugs can move rapidly, and will ram unwary targets to clear their paths as they search for food. A Pillbug can be jarred loose from a surface with a concussive blast; doing so reveals its vulnerable belly."
• Spider Guardian: "This darkling Pillbug has absorbed the power of the Spider Ball. It can travel over magnetically charged surfaces at will. The creature seems to have a connection to the local energy system. Aggravating it may cause disruptions to the system."
• Phazon Pillbug: "Pillbugs are commonly found in small spaces, often making traveling through tunnels troublesome. Bombs are effective against them, however. They are underground vermin, able to energize their hard-shelled bodies with Phazon. Once charged, they will roll into a defensive shape and charge their enemies."