Obrimus bufo is a stick insect species from the family of the Heteropterygidae native to the Philippine island of Luzon.

From these, Obrimus bufo females are distinguished by the presence of a pair of small but distinct anterior spines on the pronotum (anterior pronotals), the absence of a second, posterior pair of spines on the abdominal terga II to IV, as well as by a differently shaped preopercular organ, which has a transverse and slightly double-humped swelling on the posterior edge of the sternum VII of the abdomen.

They are as slender and spiny as those of Obrimus bicolanus, but differ from these in that their anal segment which is broadened transversely and more rectangular.

The capsule is slightly domed and shows the transverse indentation typical of Obrimus at the lower pole, which makes the eggs there appear double-humped.

The lid (operculum) is round, flat and sits on the capsule with an opercular angle of about 15°, which slopes slightly towards the ventral side.

[4] This specimen from his collection is now in the Natural History Museum, Vienna and is characterized by slightly more pronounced spines.

Frank H. Hennemann chose the Oxford female as the lectotype in 2023, as this is apparently the specimen from which Westwood had described the species in 1848.

In addition, for the scientific analysis of the Philippine Obrimini he examined a pair of the species from his collection, which was found by local collectors on June 8, 2010, in the province of Ilocos Norte, and another pair, which was also collected in the Ilocos region by Thierry Heitzmann and Albert Kang and is deposited in the Museum of Natural Sciences in Brussels.

These animals are the first records of the species since its description, and both the males and an egg taken from the ovopositor are described for the first time.

One female and three males come from Santa Ana in the province of Cagayan and thus, like the specimens from Ilocos, also from the very north of Luzon, but from considerably further east.