Hatt's thicket rat

Hatt's thicket rat (Thamnomys major) is a species of thicket rat indigenous to the northern slopes of Mount Karisimbi, an inactive volcano in North Kivu province of the Democratic Republic of the Congo. The species is identifiable only from its holotype, so its exact distribution cannot be determined. Contemporary analysis suggests a significant difference in size between the holotype and Thamnomys kempi, and the holotype also has molar features atypical of that species. Other specimens collected from the slopes of Mount Karisimbi, which Hatt had considered examples of T. major, were later described as consistent with T. kempi.