Cytotaxonomy, morphology and molecular systematics of the Bioko form of Simulium yahense (Diptera: Simuliidae)

R. J. Post*, P. K. Flook, A. L. Millest, R. A. Cheke, P. J. McCall, M. D. Wilson, M. Mustapha, S. Somiari, J. B. Davies, R. A. Mank, P. Geenen, P. Enyong, A. Sima, J. Mas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Cytotaxonomic analysis of the polytene chromosomes from larvae of the Simulium damnosum Theobald complex from the island of Bioko in Equatorial Guinea is reported, and a new endemic cytoform is described. Chromosomally this cytoform is close to both S. squamosum (Enderlein) and S. yahense Vajime & Dunbar, but is not identical to either. However, it is morphologically and enzymatically identical to S. yahense. The Bioko form was also found to differ from other cytoforms of the S. damnosum complex in West Africa in the copy number or RFLP pattern of several different repetitive DNA sequences. It is clear that the Bioko form is genetically distinct from other populations of the S. damnosum complex, and whilst it is closest to S. yahense, it shows features that suggest a high degree of geographical and genetic isolation. Such isolation is an important consideration in the assessment of the potential for onchocerciasis vector eradication on Bioko.

Original languageEnglish
Pages (from-to)145-157
Number of pages13
JournalBulletin of Entomological Research
Issue number2
StatePublished - Apr 2003
Externally publishedYes


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