Among the most interesting predators are poisonous cone shells, which feed on vertebrates or other invertebrates (depending on the species). When Conus senses presence of its prey, a single radular tooth slides into position at the tip of the proboscis. When the proboscis strikes prey, it expels the tooth like a harpoon, and the poison tranquilizes or kills the prey at once. Some species can deliver very painful stings, and the stings of several species are lethal to humans. The venom consists of a series of toxic peptides, and each Conus species carries peptides (conotoxins) specific for the neuroreceptors of its preferred prey.
Pictured is Conus milneedwardsi, commonly known to collectors as the Glory of India.