n African Entomology - Cytospecies composition of complex (Diptera: Simuliidae) breeding in Oyan River, southwestern Nigeria

Volume 24, Issue 1
  • ISSN : 1021-3589



A cytotaxonomic study was carried out to determine the species composition and dynamics of in Oyan River, an onchocerciasis mesoendemic area in southwest Nigeria. larvae were collected fortnightly from different attachments between March and November 2012 fixed in Carnoy's solution for laboratory identification using cytotaxonomic keys. A total of 255 larvae were obtained and identified from their polytene chromosomes. Beffa (56.5 %) and (43.5 %) were the two cytospecies observed. No new inversions were found in the larvae. Statistical analysis revealed a significant difference (< 0.05) in the abundance of and in relation to rainfall pattern. The sympatric breeding of both species in the area may suggest their involvement in the transmission of onchocerciasis in the area, as and Beffa are known vectors of in West Africa.

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