A new cytotype of Simulium squamosum from south-west Cameroon.
A new cytotype of Simulium squamosum Enderlein (Diptera: Simuliidae) (here named S. squamosum'D') is described from around Mount Cameroon in south-west Cameroon on the basis of sex-chromosome differences on the short arm of chromosome I. Two polymorphic inversions, IS-To (a new inversion) and IS-2, are partially Y linked. These inversions usually occur together, although IS-To has a higher frequency and is more strongly Y linked than IS-2. This sex-chromosome system has not been previously described and the occurrence and evolution of sex-chromosome systems in S. squamosum is discussed.
Mustapha
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M
Department of Entomology, The Natural History Museum, London, UK.
Post
R J
RJ
Enyong
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Lines
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J
D000818:Animals; D002163:Cameroon; D007446:Chromosome Inversion; D003582:Cytogenetics; D005260:Female; D008297:Male; D012730:Sex Chromosomes / Q000235:genetics*; D012843:Simuliidae / Q000145:classification / Q000166:cytology / Q000235:genetics* / Q000648:ultrastructure