Tregara

The pale, stone-coloured shell of the Tregara is often mistaken for part of a chamber’s ceiling—that is, until the Tregara extends its arms and snatches up it unwary prey. Similar in form to a praying mantis, the Tregara is a blind subterranean insect that uses vibrations in the air around it to hunt prey. These creatures can grow to be up to eight feet in length, and their dangerous claws and mandibles are the subjects of many Skaven nightmares.

Source

 * Warhammer Fantasy RPG 2nd ED -- Children of the Horned Rat
 * pg. 116

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