Arthropod (fauna) a creature found in the tunnels of the Nest of the Priest-Kings. It is 8 feet long and a yard high with a multi-segmented body and 8 legs. Its eyes are on long stalks.

At that moment in my horror a large, perhaps eight feet long and a yard high, multilegged, segmented arthropod scuttled near, its eyes waving on stalks 
Book 3, Priest-Kings: pg 82