The central pair of tail feathers are green and the rest dark blue.

[6] The rufous-webbed brilliant has been conclusively recorded only on the east slope of the Andes from central to southern Peru.

[7] It inhabits the interior and edges of humid montane forest at elevations between 650 and 1,700 m (2,100 and 5,600 ft).

[6] The rufous-webbed brilliant primarily forages for nectar in the forest's understory and its edges, though the species of flowering plants it feeds at are only slightly known.

The rufous-webbed brilliant's song is "a series of chew notes interspersed with a short, rapid, descending trill."

It "shows some tolerance of habitat fragmentation, degradation and disturbance; however, outright forest clearance is expected to cause local population declines.