known as Stegosaurus stenops had four dermal spikes, each about long. Discoveries of articulated stegosaur armor show that, at least in some species, these spikes protruded horizontally from the tail, not vertically as is often depicted. Initially, Marsh described S. armatus as having eight spikes in its tail, unlike S. stenops. However, recent research re-examined this and concluded this species also had four. Mathematics In a 2017 paper, the term thagomizer graph (and also the associated "thagomizer matroid") was introduced for the complete tripartite graph . See also Strigiphilus garylarsoni Tail club Timeline of stegosaur research Other scientific terms first used in fiction: Boojum tree Crash bandicoot Flange as the collective noun for baboons Horrendous Space Kablooie Quark Shmoo Snark Sonic hedgehog Waldo References Dinosaur anatomy The Far Side Stegosaurs 1980s neologisms Words originating in fiction