It belongs to the so-called "Compsus genus complex". It has been proposed that Oxyderces is a synonym of Compsus.
Description
In 1922 Sir Guy A. K. Marshall described the genus Plococompsus, which is currently a synonym of Oxyderces. This reference presents a good diagnosis for the genus:
This genus is proposed for a small homogeneous group of species of Compsus that are characterised especially by the presence of postocular vibrissae on the prothorax. Other characters are as follows: Scrobes narrow, curved downwards, but the upper edge attaining about the middle of the eye, so that the scape at rest passes across the lower half of the eye; the bare part of the scrobe not sharply defined, but gradually clothed with scales behind; epistomal setae very long and dense; scape not or only slightly exceeding the eye, comparatively slender, clavate, squamose, with the scales not overlapping; mentum with a group of setae on each side; insects with functional wings.
—Guy A. K. Marshall, VI. On new genera and species of Neotropical Curculionidae., p. 201
123Wibmer, G. J.; O'Brien, C. W. (1986). "Annotated checklist of the weevils (Curculionidae sensu lato) of South America (Coleoptera: Curculionoidea)". Memoirs of the American Entomological Institute. 39: 1–563.
↑Voss, E. (1932). "Unbeschriebene neotropische Curculioniden. I. (35. Beitrag zur Kenntnis der Curculioniden)". Revista de entomologia. Rio de Janeiro. 2 (1): 33–43.