Historically,
G. fusca was considered to occur in a wide area of tropical Africa, from
Guinea-Bissau to
Uganda. A 2024 review found that between 1990 and 2020 the species only had confirmed occurrences in five countries:
Cameroon, the
Central African Republic,
Gabon,
Nigeria, and
Togo. The prime habitat of
G. fusca is rainforest edges, but it also occurs within rainforest, in isolated areas of forest in savannah, and along the edges of rivers. The subspecies
G. fusca fusca has been recorded in the western part of the main species range, while
G. fusca congolensis has been recorded in the eastern part. The transition between the two subspecies, is generally considered to be between
Ghana, Togo and
Benin but is less clearly identified. Some authors may have overlooked the overlap of
G. fusca fusca and
G. fusca congolensis in
Cameroon.
Glossina fusca congolensis Glossina fusca congolensis mainly occupies the eastern part of the geographical range of
Glossina fusca, from Nigeria to the Central African Republic, even though, since its distribution overlaps in some areas with that of
Glossina fusca fusca, the main transition area between the two subspecies is not well delineated. In a review of the scientific literature from 1990 to 2020,
G. fusca congolensis was reported from four countries; Cameroon, the Central African Republic, Gabon and Nigeria.
Glossina fusca fusca Glossina fusca fusca mainly occupies the western part of the geographical range of
Glossina fusca, from Guinea-Bissau to Cameroon, even though, since its distribution overlaps in some areas with that of
Glossina fusca congolensis, the main transition area between the two subspecies is not well delineated. In a review of the scientific literature from 1990 to 2020,
G. fusca fusca was only reported from two countries: Cameroon, ==References==