title: Cytotaxonomic confirmation of two forms of Simulium sirbanum in the eastern part of the Onchocerciasis Control Programme in West Africa.
abstract: An earlier report (Cheke et al., 1987) of morphological differences between populations of Simulium sirbanum Vajime & Dunbar in West Africa was confirmed cytotaxonomically. Populations with adult males having Type III scutal patterns were associated with male larvae heterozygous for the inversion IS-3, whereas adult males with Type IV scutal patterns were associated with larvae homozygous for IS-3. The taxonomic implications are briefly discussed but the evidence is considered to be inappropriate for resurrecting S. sudanense Vajime & Dunbar. Aspects of the biology of the two forms and their importance in onchocerciasis transmission are discussed.
authors.affiliation: WHO Onchocerciasis Control Programme, Ouagadougou, Burkina Faso, West Africa.
authors.forename: G K
authors.initials: GK
authors.lastname: Fiasorgbor
authors.forename: R A
authors.initials: RA
authors.lastname: Cheke
mesh_terms: D000354:Africa, Western; D000818:Animals; D007446:Chromosome Inversion; D005260:Female; D006579:Heterozygote; D006720:Homozygote; D007303:Insect Vectors / Q000033:anatomy & histology / Q000145:classification* / Q000235:genetics; D008297:Male; D009855:Onchocerciasis / Q000635:transmission*; D012843:Simuliidae / Q000033:anatomy & histology / Q000145:classification* / Q000235:genetics