A new cytotype of Simulium squamosum from south-west Cameroon.

MMustapha; RJPost; PEnyong; J Lines ORCID logo; (2004) A new cytotype of Simulium squamosum from south-west Cameroon. Medical and veterinary entomology, 18 (3). pp. 296-300. ISSN 0269-283X DOI: 10.1111/j.0269-283X.2004.00501.x
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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.


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