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Marius IV was a planet, located somewhere in the space of the galaxy's Alpha or Beta Quadrants, the fourth planet in orbit of the Marius star system.
Marius IV was in or near the boundaries of 23rd century Federation space. This planet had been the subject of scientific study at some point before stardate 6451.3, in the late 2260s decade. Marius IV was noted to be the homeworld to a form of diplopoda lifeform. (TOS novel: Vulcan!)