Sex chromosome variation and cytotaxonomy of the onchocerciasis vector Simulium squamosum in Cameroon and Nigeria |
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Authors: | M Traore-Lamizana S Somiari H B Mafuyai C G Vajime R J Post |
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Institution: | Institute Pierre Richet, Bouaké, C?te d'Ivoire, Nigeria. |
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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. |
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Keywords: | Simulium damnosum complex S squamosum cytogenetics hybridiz ation onchocerciasis sex-chromosomes sibling species taxonomy Cameroon Nigeria |
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