Stilph

The Stilph are a species native to a region just inside the Galactic Barrier of the Milky Way Galaxy.

Culture
By 3190, the Stilph were warp-capable though they never dealings with the Federation, but maintained contact with the Orions. The Stilph provided vital intelligence on origin of the Dark Matter Anomaly threatening the galaxy as threir stellar surveys revealed a giant massive unknown field just outside the confines of the galaxy.

Source

 * Star Trek Discovery: Season 4 Episode 8: All In