Gapteyn is a post X-Day Hyper-Zoanoid model that appears in the Guyver manga. This stocky Zoanoid slightly resembles a humanoid goat, but its horns are actually segmented tentacles that serve as balance regulators. Its hardened shoulders are equipped with bio-laser cannons. Little else is known about this Zoanoid's abilities.

Gapteyn was developed at Cronosheadquarters in Arizona and was among hundreds of bio-blaster types assigned to defend the base's psycho-wave generator when the base was attacked by Gigantic Dark and Zeus' Thunderbolt.