The Illyrians were a humanoid species native to a planet in the Delphic Expanse.

The Starfleet vessel Enterprise NX-01 was assisted in its repair efforts by an Illyrian starship that had been disabled by an anomaly field in 2154. Enterprise helped the Illyrians in turn. They were unwilling, however, to part with their warp coil because not having it would mean a three-year journey home. Jonathan Archer and the MACOs boarded the Illyrian craft and stole their warp coil. (ENT: "Damage")

The Illyrians' cranial ridges resemble that of the Tanugans.
It was important to the ENT writing staff that, when Enterprise departed from them, the Illyrians in "Damage" be left "stranded and as good as dead," as the writers hoped that would accentuate the moral conflict Archer and the Enterprise crew were put in. (Star Trek: Communicator issue 151, p. 33)


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