1-7 X4 Seed

The top center of this 1-7 X4 Seed Onion dome is made of four (4) pairs of #1 & #7 mogharnas tiles. (See images.) The expanded version of this dome moves opposite pairs of domes pieces, each made up of dozens of the sixteen (16) muqarnas tile types. This results in four ‘ridged’ or ‘accordion’ folded connecting regions in the expanded tiers.
 
This expansion approach can be seen in the symmetry family of mogharnas domes which can be seen here.