The Alcyones were a spacefaring civilization that destroyed, what was believed by the Federation, the last Tarellian vessel in 2356.

It was later discovered that the ship they destroyed was not the last plague ship, following the discovery of another such vessel near the star Beta Cassius in 2364. (TNG: "Haven")

According to the, this species originated from a planet orbiting the star Alcyone (Eta Tauri). This star, located about 541 light years from Sol, was a B class giant.
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