title: Sex chromosome variation and cytotaxonomy of the onchocerciasis vector Simulium squamosum in Cameroon and Nigeria.
abstract: On the basis of sex chromosome variation, three cytotypes of Simulium squamosum (Enderlein) (Diptera: Simuliidae) are described from Cameroon and Nigeria. Simulium squamosum A is the typical form as originally described by Vajime & Dunbar (1975) with chromosome I as the sex chromosome. It occurs throughout most of Cameroon and south-east Nigeria. A second cytotype, S. squamosum B, is described from the river Sanaga (Cameroon). It also has chromosome I as the sex chromosome, but the nature of the sex differential region is different. Simulium squamosum C has no sex-linked chromosomal rearrangements. It is widespread in Nigeria and occurs near Mount Cameroon, where it seems to hybridize with S. squamosum A.
authors: Institute Pierre Richet, Bouaké, Côte d'Ivoire, Nigeria.
authors: M
authors: M
authors: Traore-Lamizana
authors: S
authors: S
authors: Somiari
authors: H B
authors: HB
authors: Mafuyai
authors: C G
authors: CG
authors: Vajime
authors: R J
authors: RJ
authors: Post
mesh_terms: D000818:Animals; D002163:Cameroon; D005260:Female; D014644:Genetic Variation / Q000235:genetics*; D007621:Karyotyping; D008297:Male; D009549:Nigeria; D012730:Sex Chromosomes / Q000235:genetics* / Q000648:ultrastructure; D012843:Simuliidae / Q000145:classification / Q000235:genetics*