[2] The specific name, championi, is in honor of English entomologist George Charles Champion.

[3] The preferred natural habitat of G. championi is forest, at an altitude of 1,370 m (4,490 ft).

[1] The holotype of G. championi, a male, has a snout-to-vent length (SVL) of 21 cm (8.3 in), with a tail 4 cm (1.6 in) long.

Dorsally, it is uniformly iridescent black.

The ventrals and the subcaudals are whitish, edged with black.