While superficially similar to the thermal pits of vipers, its function remains unknown.

[3] It is found in Cameroon, Equatorial Guinea, Gabon, and the Democratic Republic of Congo (Zaire).

The head is distinct from the neck, and the eyes are rather small, with round pupils.

The loreal region is deeply concave, with the pit entering the eye.

Ventrally, it is pale brown, with whitish dots or short streaks.

[4] The snout is projecting and obliquely truncated; the loreal region is vertical.