The above is, as Max said, a grub.
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Meetles are a wildlife that starts out as a larva and can turn into one of two adult forms depending on its diet. If it eats a herbivorous diet, it becomes peaceful and gentle, and is used by Mudokons. If it eats meat, it becomes an aggressive Mug, used as living tanks by the Glukkons.
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A Mug.
Possibly the other form. EDIT: Or a Mug without armour.