Great cycloantiprism

The great cycloantiprism or gocap is a nonconvex scaliform polychoron that consists of 50 tetrahedra, 10 pentagonal prisms, and 50 square pyramids. 4 tetrahedra, 2 pentagonal prisms, and 5 square pyramids join at each vertex.

Related polychora
The great dishexacosiswirlprismatic hecatonicosachoron, a compound of 12 great cycloantiprisms, exists in the regiment of the small stellated hecatonicosachoron.