[1][4] K. vosseleri is only found in forests in the East Usambara Mountains of Tanzania, at an altitude of up to c. 1,500 m (4,900 ft).

[1] Its range overlaps with the closely related K. matschiei, whereas K. multituberculata is found in the West Usambara Mountains.

[4] K. vosseleri is a medium-large species in the genus Kinyongia at up to 29.5 cm (11.6 in) in total length, with the tail making up more than half of that.

Uniquely in the "two-horned Usambara group", adult females of K. vosseleri entirely lack horns (in K. matschiei and K. multituberculata, adult females have small horns; however, juveniles are essentially hornless).

The only close relatives where the adult female lacks horns are K. boehmei and K. tavetana, but they are not from the Usambaras.