The Serilians were a space-faring species.

In 2371, before an ambassador from this species arrived at space station Deep Space 9, the security protocols were checked by Kira Nerys. She requested that Odo inform her when the ambassador arrived. (DS9: "Meridian")

According to StarTrek.com, the conjectural homeworld of this species was named Serilia and the Serilians were identified as Tiron's species.
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