The subject of this article or section originates from non-canonical sources. To find out about what is considered "canon" see LOTR:Canon.
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While the content of this article is based on official information, the actual name of the subject is conjectural, and is yet to or cannot be officially named.
These centipedes live underground, and emerge from trapdoor-like lids. In The Hobbit: The Desolation of Smaug, when Bilbo Baggins falls from the trees when killing a Giant Spider in Mirkwood, he loses the One Ring. As he goes to retrieve it, a Mirkwood Centipede emerges and walks over the Ring in front of Bilbo. But before it is able to strike, Bilbo severed one of its mandibles with Sting, and stabbed its underside. The centipede collapsed, and he slew it by striking its head.