A Talarian hook spider is an arachnid species, with legs approximately a half meter in length. The Zayran system was infested with these creatures in the mid-to-late 24th century. During this time, Miles O'Brien was called in to reroute an emitter array at a starbase on Zayra IV, when he encountered twenty hook spiders in a Jefferies tube. He would recall that this incident helped stem his fear of arachnids. (TNG: "Realm of Fear")