Abstract: Morphometric analysis of Anopheles gambiae complex was carried out in Abeokuta metropolis. Six characters including the antennal length, wing length, proboscis length, fore leg length, mid leg length and hind leg length, were measured in 364 individual samples of Anopheles gambiae complex collected between August 2005 and July 2006 using light traps. The monthly mean length of each character was subject to regression analysis while co-efficient of difference (CD) was used to determine the presence of sibling species. The results revealed that the mean length in each character was higher for the wet season population as compared with the dry season population. However, the regression analysis showed that the variation was not season specific (P>0.05). Only the antennal length and wing length indicated two distinct populations when subjected to co-efficient of difference (CD>1.28), while other characters indicated one population. The results therefore suggest that the antennal length and wing length may be of significant value in sorting siblings of A. gambiae complex in the study area.

Key words: Monsuru Adebayo ADELEKE