A skeleton structure with a predicted bandgap between the 5th and 6th bands has been theoretically calculated (see Figure). Below the critical refractive index contrast, skeleton structures enable broader pseudogaps in the range of the 5th and 6th bands. The contrast required for this new gap is nearly the same (2.9) as that of the 8-9 gap of residual volume structures. A titania skeleton structure has been realized experimentally as shown on the cover.