Ganewmede

Ganewmedes (ガニュメデ Ganyumede) are skeletonized Monoeyes that have appeared in all three Kid Icarus games to date.

Characteristics
Ganewmedes are said to be a different form of Monoeye or perhaps even the living skeletal remains of them. They retain their massive single eye but seemingly evolve a functional jawbone that, in some cases, can produce spiked projectiles as an attack. Ganewmedes are capable of flight without the need for wings and are able to maneuver themselves through the air using their feelers (or, in the case of Kid Icarus: Uprising, claws). However, the Cyclops Skull variation lacks feelers altogether, despite them still being able to fly.

Kid Icarus
"Evolved from a Monoeye. It's a floating life form that builds its nest in fortresses. It stands guard over the fortress with its enormous eye. Watch out for its feelers. They are weapons."

Here, they appear in packs of eight, only in the Underworld Fortress, and use swarming attack patterns.

Kid Icarus: Of Myths and Monsters
"Appear in the air above Pit, flying around in groups."

It's known as the Cyclops Skull here, and uses swooping tactics. It's not found in the Fortress.

Kid Icarus: Uprising
Ganewmedes return as enemies in the game. They prefer to float in the air and attack Pit by spitting out spiked balls that can follow him. They are notably stronger than in the previous games, and now have claws instead of tentacles to move around with.

Idol Description
''Ganewmedes are evolved Monoeyes whose tentacles have been replaced by spiky legs. They respond violently when fired upon, so approach them calmly and use melee attacks to take them out without getting hurt.''

Trivia

 * Ganymede was the most attractive of mortals and a Prince of Troy. Zeus kidnapped him from his homeland to serve as cup-bearer and paramour. In astronomy, Ganymede is, fittingly, a moon of Jupiter. Interestingly, Tros, another monster in the Kid Icarus series, was the name of Ganymede's father.
 * It is interesting to note that despite the Ganewmede being a skeletal version of the Monoeye, the latter has no discernable mouth despite the former having a visible jaw bone.