Species 125, Dark frontier

The Borg Queen, former member of Species 125

Species 125 was the Borg designation for a humanoid race which, by the 2360s, had been assimilated into the Collective.

One notable member of Species 125 was one of the Borg Queens, one of which was first encountered by Captain Jean-Luc Picard in 2366, before the Battle of Wolf 359. In 2375, the second Queen encountered stated the designation of her species, when she kidnapped Seven of Nine. (Star Trek: First Contact; VOY: "Dark Frontier")

In VOY: "Unimatrix Zero, Part II", the Borg Queen stated, she was assimilated around the same age as a young alien child in the episode, suggesting her species was assimilated well before the 2360s.
In the Star Trek: Legacy segment "The Origin of the Borg", it is stated that the collective found the females of certain species (likely referring to Species 125) displayed a mental prowess, enabling them to sift through thousands of thoughts and bring order to chaos.
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