Mezoti's Teirenian ant colony
The Teirenian ant was an insect similar to the Terran ant. A fluorescent enzyme was produced by the Teirenian ant drones and activated by their queen.
At the first Annual Voyager Science Fair on the USS Voyager, in 2376, Mezoti presented a transparent box containing soil and a colony of luminescent Teirenian ants. She had infused the soil with a blue ion dye so the insects would be easier to see. (VOY: "Child's Play")