Ovions are a four-armed bipedal man-sized insectoid species that were members of the Cylon Alliance to whow Their tylium mines were an extremely valuable asset. They manage a Gambling ans entertainment complex on the surface of their homeworld to attract preys. Individual humans are trapped selectively and taken into the hive-like structures underground to be placed into chambers which slowly transform them into food. Ovions occasionally prowl discreetly on the entertainment level, but generally remain out of sight.
They are now presumably extinct since their world was destroyed in the explosion of their tylium mines.
Source: Battlestar Galactica Universe (Saga of a Star World).