The Mulzirak are a spacefaring species.
In 2363, the crew of the USS Albany mediated a dispute between the Mulzirak and the Betelgeusians over the latters demands to be allowed through Mulzirak space. (TNG novel: The Buried Age)
In 2369, Vash booked transport on a Mulzirak ship that was leaving Deep Space 9. (DS9 episode: "Q-Less")