The poison urchip is the next generation of urchip. Due to the feeding of the parrotworms and other reef predators, it has developed taller spikes that are poisonous. It has also shrunk its tentacles for a closer grip and less to bite. The eyes have moved onto either side for better vision. It also still has the acidic tooth, which its uses to dissolve the crystal shrubite to eat. Its tail has lost the ability to swim, so it must crawl around the surface of the crystal shrubite to get anywhere.