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Electron micrograph of business end of the Haptoglossa Gun Cell.  The harpoon-shaped projectile with the laminated arowhead is clearly seen sitting in a chamber in the barrel of the gun.  Photograph by Jane Robb, University of Guelph.   The projectile is shot through the wall of the victim (nematode, rotifer, tardigrade) and the cell then inserts a hypodermic through the hole and injects a spore-like cell that grows and consumes the victim.  Return to Haptoglossa for more details.