Final answer:
The specialized cells used for toxic stings are cnidocytes, found in cnidarians like jellyfish and sea anemones, which contain nematocysts that fire a barb and toxin to immobilize prey.
Step-by-step explanation:
The type of specialized cell used to deliver toxic stings to other organisms is known as a stinging cell, or more specifically, a cnidocyte. Organisms from the phylum Cnidaria, such as jellyfish, coral, and sea anemones, possess these cnidocytes. Each cnidocyte contains a large organelle called a nematocyst, which stores a coiled thread and a barb. Upon tactile stimulation, such as when prey touches the cnidocil on the cell surface, the nematocyst fires the thread, barb, and toxin with rapid acceleration to either entangle or penetrate the prey, releasing toxins and often causing immobilization or paralysis