The subspecific name, fitchi, is in honor of Free Methodist minister Stephen Fitch who was one of the collectors of the holotype.

[2][3] T. harennae is native to the Bale Mountains in the regional state of Oromia in Ethiopia.

[1][2] The preferred natural habitats of T. harennae are forest and shrubland (above treeline), at altitudes of 2,400–3,300 m (7,900–10,800 ft).

[1] T. harennae may attain a total length (including tail) of 13.8 cm (5.4 in).

[2] Nota bene: A trinomial authority in parentheses indicates that the subspecies was originally described in a genus other than Trioceros.