Among the many specimens that Dr. Arzt collected on the island was a female Medusa spider, Latrodectus regina. When, on the twenty-fourth day after the crash, Nikki approached Arzt about helping her try to locate her missing bag with his knowledge of trajectories, she examined his Medusa spider specimen. Arzt proceded to explain that the pheromones of the female Medusa spider were strong enough to quickly attract all the male Medusas in quite a large radius.